16391644900 has 36 divisors (see below), whose sum is σ = 35601787312. Its totient is φ = 6550774560.

The previous prime is 16391644883. The next prime is 16391644937. The reversal of 16391644900 is 944619361.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39319 + ... + 185281.

Almost surely, 2^16391644900 is an apocalyptic number.

16391644900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16391644900 is an abundant number, since it is smaller than the sum of its proper divisors (19210142412).

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

16391644900 is a wasteful number, since it uses less digits than its factorization.

16391644900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147100 (or 147093 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 16391644900 in words is "sixteen billion, three hundred ninety-one million, six hundred forty-four thousand, nine hundred".