81610908860975 has 48 divisors (see below), whose sum is σ = 111054239823744. Its totient is φ = 59120880000000.

The previous prime is 81610908860953. The next prime is 81610908861007. The reversal of 81610908860975 is 57906880901618.

It is not a de Polignac number, because 81610908860975 - 2²² = 81610904666671 is a prime.

It is a super-2 number, since 2×81610908860975² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120253850 + ... + 120930600.

It is an arithmetic number, because the mean of its divisors is an integer number (2313629996328).

Almost surely, 2^{81610908860975} is an apocalyptic number.

81610908860975 is a deficient number, since it is larger than the sum of its proper divisors (29443330962769).

81610908860975 is a wasteful number, since it uses less digits than its factorization.

81610908860975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683828 (or 683823 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 68.

The spelling of 81610908860975 in words is "eighty-one trillion, six hundred ten billion, nine hundred eight million, eight hundred sixty thousand, nine hundred seventy-five".