81079656258 has 32 divisors (see below), whose sum is σ = 172077696000. Its totient is φ = 25413321296.

The previous prime is 81079656253. The next prime is 81079656263. The reversal of 81079656258 is 85265697018.

It is an interprime number because it is at equal distance from previous prime (81079656253) and next prime (81079656263).

It is a junction number, because it is equal to n+sod(n) for n = 81079656198 and 81079656207.

It is not an unprimeable number, because it can be changed into a prime (81079656253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4970958 + ... + 4987241.

It is an arithmetic number, because the mean of its divisors is an integer number (5377428000).

Almost surely, 2^81079656258 is an apocalyptic number.

81079656258 is an abundant number, since it is smaller than the sum of its proper divisors (90998039742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81079656258 is a wasteful number, since it uses less digits than its factorization.

81079656258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9958286.

The product of its (nonzero) digits is 7257600, while the sum is 57.

The spelling of 81079656258 in words is "eighty-one billion, seventy-nine million, six hundred fifty-six thousand, two hundred fifty-eight".