81071137821115 has 32 divisors (see below), whose sum is σ = 111836287180800. Its totient is φ = 55918143469440.

The previous prime is 81071137821101. The next prime is 81071137821133. The reversal of 81071137821115 is 51112873117018.

It is not a de Polignac number, because 81071137821115 - 2⁵ = 81071137821083 is a prime.

It is a super-2 number, since 2×81071137821115² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 462198555 + ... + 462373924.

It is an arithmetic number, because the mean of its divisors is an integer number (3494883974400).

Almost surely, 2^{81071137821115} is an apocalyptic number.

81071137821115 is a deficient number, since it is larger than the sum of its proper divisors (30765149359685).

81071137821115 is a wasteful number, since it uses less digits than its factorization.

81071137821115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924572587.

The product of its (nonzero) digits is 94080, while the sum is 46.

The spelling of 81071137821115 in words is "eighty-one trillion, seventy-one billion, one hundred thirty-seven million, eight hundred twenty-one thousand, one hundred fifteen".