81614517924 has 24 divisors (see below), whose sum is σ = 190440633600. Its totient is φ = 27203873824.

The previous prime is 81614517913. The next prime is 81614517947. The reversal of 81614517924 is 42971541618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286477 + ... + 495275.

It is an arithmetic number, because the mean of its divisors is an integer number (7935026400).

Almost surely, 2^81614517924 is an apocalyptic number.

It is an amenable number.

81614517924 is an abundant number, since it is smaller than the sum of its proper divisors (108826115676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81614517924 is a wasteful number, since it uses less digits than its factorization.

81614517924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241379 (or 241377 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The spelling of 81614517924 in words is "eighty-one billion, six hundred fourteen million, five hundred seventeen thousand, nine hundred twenty-four".