81395059684 has 12 divisors (see below), whose sum is σ = 147353125500. Its totient is φ = 39294166688.

The previous prime is 81395059663. The next prime is 81395059699. The reversal of 81395059684 is 48695059318.

It can be written as a sum of positive squares in 2 ways, for example, as 41763009600 + 39632050084 = 204360^2 + 199078^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350840659 + ... + 350840890.

It is an arithmetic number, because the mean of its divisors is an integer number (12279427125).

Almost surely, 2^81395059684 is an apocalyptic number.

It is an amenable number.

81395059684 is a deficient number, since it is larger than the sum of its proper divisors (65958065816).

81395059684 is a wasteful number, since it uses less digits than its factorization.

81395059684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701681582 (or 701681580 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 58.

The spelling of 81395059684 in words is "eighty-one billion, three hundred ninety-five million, fifty-nine thousand, six hundred eighty-four".