81769632593931 has 24 divisors (see below), whose sum is σ = 122214376730160. Its totient is φ = 52620460401600.

The previous prime is 81769632593927. The next prime is 81769632593953. The reversal of 81769632593931 is 13939523696718.

81769632593931 is a `hidden beast` number, since 8 + 1 + 76 + 96 + 32 + 59 + 393 + 1 = 666.

It is not a de Polignac number, because 81769632593931 - 2² = 81769632593927 is a prime.

It is a super-2 number, since 2×81769632593931² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81769632593931.

It is not an unprimeable number, because it can be changed into a prime (81769632513931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37222840 + ... + 39358341.

It is an arithmetic number, because the mean of its divisors is an integer number (5092265697090).

Almost surely, 2^{81769632593931} is an apocalyptic number.

81769632593931 is a deficient number, since it is larger than the sum of its proper divisors (40444744136229).

81769632593931 is a wasteful number, since it uses less digits than its factorization.

81769632593931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76585307 (or 76585304 counting only the distinct ones).

The product of its digits is 396809280, while the sum is 72.

The spelling of 81769632593931 in words is "eighty-one trillion, seven hundred sixty-nine billion, six hundred thirty-two million, five hundred ninety-three thousand, nine hundred thirty-one".