81300572464 has 20 divisors (see below), whose sum is σ = 162951579360. Its totient is φ = 39248552000.

The previous prime is 81300572461. The next prime is 81300572471. The reversal of 81300572464 is 46427500318.

It is not an unprimeable number, because it can be changed into a prime (81300572461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87607912 + ... + 87608839.

It is an arithmetic number, because the mean of its divisors is an integer number (8147578968).

Almost surely, 2^81300572464 is an apocalyptic number.

It is an amenable number.

81300572464 is an abundant number, since it is smaller than the sum of its proper divisors (81651006896).

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

81300572464 is a wasteful number, since it uses less digits than its factorization.

81300572464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175216788 (or 175216782 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 81300572464 in words is "eighty-one billion, three hundred million, five hundred seventy-two thousand, four hundred sixty-four".