81575580524 has 6 divisors (see below), whose sum is σ = 142757265924. Its totient is φ = 40787790260.

The previous prime is 81575580523. The next prime is 81575580551. The reversal of 81575580524 is 42508557518.

It is a super-2 number, since 2×81575580524² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81575580523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10196947562 + ... + 10196947569.

It is an arithmetic number, because the mean of its divisors is an integer number (23792877654).

Almost surely, 2^81575580524 is an apocalyptic number.

It is an amenable number.

81575580524 is a deficient number, since it is larger than the sum of its proper divisors (61181685400).

81575580524 is a wasteful number, since it uses less digits than its factorization.

81575580524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20393895135 (or 20393895133 counting only the distinct ones).

The product of its (nonzero) digits is 2240000, while the sum is 50.

The spelling of 81575580524 in words is "eighty-one billion, five hundred seventy-five million, five hundred eighty thousand, five hundred twenty-four".