81302607564 has 48 divisors (see below), whose sum is σ = 196841970528. Its totient is φ = 26096560128.

The previous prime is 81302607557. The next prime is 81302607629. The reversal of 81302607564 is 46570620318.

It is a super-2 number, since 2×81302607564² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 900819 + ... + 986954.

It is an arithmetic number, because the mean of its divisors is an integer number (4100874386).

Almost surely, 2^81302607564 is an apocalyptic number.

It is an amenable number.

81302607564 is an abundant number, since it is smaller than the sum of its proper divisors (115539362964).

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

81302607564 is a wasteful number, since it uses less digits than its factorization.

81302607564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887914 (or 1887912 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 81302607564 in words is "eighty-one billion, three hundred two million, six hundred seven thousand, five hundred sixty-four".