16580393664 has 28 divisors (see below), whose sum is σ = 43868958744. Its totient is φ = 5526797824.

The previous prime is 16580393659. The next prime is 16580393689. The reversal of 16580393664 is 46639308561.

It is a happy number.

It is a super-2 number, since 2×16580393664² (a number of 21 digits) contains 22 as substring.

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, 43177917 + ... + 43178300.

Almost surely, 2^16580393664 is an apocalyptic number.

It is an amenable number.

16580393664 is an abundant number, since it is smaller than the sum of its proper divisors (27288565080).

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

16580393664 is an equidigital number, since it uses as much as digits as its factorization.

16580393664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86356232 (or 86356222 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 16580393664 in words is "sixteen billion, five hundred eighty million, three hundred ninety-three thousand, six hundred sixty-four".