81600873616 has 20 divisors (see below), whose sum is σ = 158390743792. Its totient is φ = 40725842976.

The previous prime is 81600873581. The next prime is 81600873617. The reversal of 81600873616 is 61637800618.

It is not an unprimeable number, because it can be changed into a prime (81600873617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4653090 + ... + 4670593.

Almost surely, 2^81600873616 is an apocalyptic number.

It is an amenable number.

81600873616 is a deficient number, since it is larger than the sum of its proper divisors (76789870176).

81600873616 is a wasteful number, since it uses less digits than its factorization.

81600873616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9324238 (or 9324232 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 81600873616 in words is "eighty-one billion, six hundred million, eight hundred seventy-three thousand, six hundred sixteen".