81627504592 has 20 divisors (see below), whose sum is σ = 158200449796. Its totient is φ = 40801582080.

The previous prime is 81627504583. The next prime is 81627504617. The reversal of 81627504592 is 29540572618.

It can be written as a sum of positive squares in 2 ways, for example, as 38120219536 + 43507285056 = 195244^2 + 208584^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705183 + ... + 812734.

Almost surely, 2^81627504592 is an apocalyptic number.

It is an amenable number.

81627504592 is a deficient number, since it is larger than the sum of its proper divisors (76572945204).

81627504592 is a wasteful number, since it uses less digits than its factorization.

81627504592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521286 (or 1521280 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 81627504592 in words is "eighty-one billion, six hundred twenty-seven million, five hundred four thousand, five hundred ninety-two".