16516417920 has 64 divisors (see below), whose sum is σ = 52646088240. Its totient is φ = 4404377600.

The previous prime is 16516417919. The next prime is 16516417943. The reversal of 16516417920 is 2971461561.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4299231 + ... + 4303070.

Almost surely, 2^16516417920 is an apocalyptic number.

16516417920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16516417920 is an abundant number, since it is smaller than the sum of its proper divisors (36129670320).

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

16516417920 is an equidigital number, since it uses as much as digits as its factorization.

16516417920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8602323 (or 8602311 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

It can be divided in two parts, 1651641 and 7920, that added together give a palindrome (1659561).

The spelling of 16516417920 in words is "sixteen billion, five hundred sixteen million, four hundred seventeen thousand, nine hundred twenty".