16515456664 has 24 divisors (see below), whose sum is σ = 36022234140. Its totient is φ = 7078052688.

The previous prime is 16515456647. The next prime is 16515456679. The reversal of 16515456664 is 46665451561.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21065242 + ... + 21066025.

Almost surely, 2^16515456664 is an apocalyptic number.

16515456664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16515456664 is an abundant number, since it is smaller than the sum of its proper divisors (19506777476).

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

16515456664 is a wasteful number, since it uses less digits than its factorization.

16515456664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42131287 (or 42131276 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 49.

The spelling of 16515456664 in words is "sixteen billion, five hundred fifteen million, four hundred fifty-six thousand, six hundred sixty-four".