Hioutthere's Number

Hioutthere's Number is a huge irrational number. It can be simplified to to 25.8 duoseptuagintillion, or 2.58 × 10220.

Here are the first 258 digits of the number:
25,853,516,503,948,186,379,668,061,386,221,664,457,575,688,481,611,788,425,528,234,588,791,637,959,272,410,299,717,568,982,019,792,639,306,990,885,105,099,150,105,598,486,652,077,668,912,956,945,267,994,523,777,951,717,563,832,636,784,439,308,148,786,171,118,152,796,244,163,497,841,080,817,876.549715353360805985186142774847138986

Formula
The formula for this number is (πe)(eπ)(129!). The number 129 corresponds to the sum of the placements of each of the letters in Hioutthere. H = 8, I = 9, O = 15, U = 21, T = 20, etc.