19465620864 has 32 divisors (see below), whose sum is σ = 51705556440. Its totient is φ = 6488540160.

The previous prime is 19465620847. The next prime is 19465620871. The reversal of 19465620864 is 46802656491.

It is a tau number, because it is divible by the number of its divisors (32).

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, 25345477 + ... + 25346244.

Almost surely, 2^19465620864 is an apocalyptic number.

It is an amenable number.

19465620864 is an abundant number, since it is smaller than the sum of its proper divisors (32239935576).

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

19465620864 is an equidigital number, since it uses as much as digits as its factorization.

19465620864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50691738 (or 50691726 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 19465620864 in words is "nineteen billion, four hundred sixty-five million, six hundred twenty thousand, eight hundred sixty-four".