19539056464 has 20 divisors (see below), whose sum is σ = 39078113920. Its totient is φ = 9454381920.

The previous prime is 19539056441. The next prime is 19539056483. The reversal of 19539056464 is 46465093591.

It is a happy number.

19539056464 is an admirable number.

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, 19696134 + ... + 19697125.

It is an arithmetic number, because the mean of its divisors is an integer number (1953905696).

Almost surely, 2^19539056464 is an apocalyptic number.

It is an amenable number.

19539056464 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19539056464 is a wasteful number, since it uses less digits than its factorization.

19539056464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39393298 (or 39393292 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 19539056464 in words is "nineteen billion, five hundred thirty-nine million, fifty-six thousand, four hundred sixty-four".