81592257051 has 12 divisors (see below), whose sum is σ = 122979634128. Its totient is φ = 52029844944.

The previous prime is 81592257041. The next prime is 81592257121. The reversal of 81592257051 is 15075229518.

81592257051 is a `hidden beast` number, since 8 + 1 + 5 + 9 + 22 + 570 + 51 = 666.

It is not a de Polignac number, because 81592257051 - 2²⁵ = 81558702619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81592256988 and 81592257006.

It is not an unprimeable number, because it can be changed into a prime (81592257041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197082540 + ... + 197082953.

It is an arithmetic number, because the mean of its divisors is an integer number (10248302844).

Almost surely, 2^81592257051 is an apocalyptic number.

81592257051 is a deficient number, since it is larger than the sum of its proper divisors (41387377077).

81592257051 is a wasteful number, since it uses less digits than its factorization.

81592257051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394165522 (or 394165519 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 45.

The spelling of 81592257051 in words is "eighty-one billion, five hundred ninety-two million, two hundred fifty-seven thousand, fifty-one".