81594254572 has 24 divisors (see below), whose sum is σ = 146192324432. Its totient is φ = 39826080000.

The previous prime is 81594254549. The next prime is 81594254597. The reversal of 81594254572 is 27545249518.

It is a happy number.

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, 178072 + ... + 441472.

Almost surely, 2^81594254572 is an apocalyptic number.

It is an amenable number.

81594254572 is a deficient number, since it is larger than the sum of its proper divisors (64598069860).

81594254572 is a wasteful number, since it uses less digits than its factorization.

81594254572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265249 (or 265247 counting only the distinct ones).

The product of its digits is 4032000, while the sum is 52.

The spelling of 81594254572 in words is "eighty-one billion, five hundred ninety-four million, two hundred fifty-four thousand, five hundred seventy-two".