81537030572 has 12 divisors (see below), whose sum is σ = 151083321480. Its totient is φ = 38370367296.

The previous prime is 81537030481. The next prime is 81537030599. The reversal of 81537030572 is 27503073518.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599536922 + ... + 599537057.

It is an arithmetic number, because the mean of its divisors is an integer number (12590276790).

Almost surely, 2^81537030572 is an apocalyptic number.

It is an amenable number.

81537030572 is a deficient number, since it is larger than the sum of its proper divisors (69546290908).

81537030572 is a wasteful number, since it uses less digits than its factorization.

81537030572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199074000 (or 1199073998 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 81537030572 in words is "eighty-one billion, five hundred thirty-seven million, thirty thousand, five hundred seventy-two".