81013357604172 has 48 divisors (see below), whose sum is σ = 216857048550912. Its totient is φ = 23058663429120.

The previous prime is 81013357604111. The next prime is 81013357604183. The reversal of 81013357604172 is 27140675331018.

It is a super-2 number, since 2×81013357604172² (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 15 ways as a sum of consecutive naturals, for example, 1833523029 + ... + 1833567212.

It is an arithmetic number, because the mean of its divisors is an integer number (4517855178144).

Almost surely, 2^{81013357604172} is an apocalyptic number.

It is an amenable number.

81013357604172 is an abundant number, since it is smaller than the sum of its proper divisors (135843690946740).

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

81013357604172 is a wasteful number, since it uses less digits than its factorization.

81013357604172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667090518 (or 3667090516 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 81013357604172 in words is "eighty-one trillion, thirteen billion, three hundred fifty-seven million, six hundred four thousand, one hundred seventy-two".