81362713688 has 16 divisors (see below), whose sum is σ = 152591673480. Its totient is φ = 40671600768.

The previous prime is 81362713603. The next prime is 81362713727. The reversal of 81362713688 is 88631726318.

It is a super-2 number, since 2×81362713688² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 1184006 + ... + 1250837.

Almost surely, 2^81362713688 is an apocalyptic number.

It is an amenable number.

81362713688 is a deficient number, since it is larger than the sum of its proper divisors (71228959792).

81362713688 is a wasteful number, since it uses less digits than its factorization.

81362713688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439026 (or 2439022 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 53.

The spelling of 81362713688 in words is "eighty-one billion, three hundred sixty-two million, seven hundred thirteen thousand, six hundred eighty-eight".