16399755976 has 64 divisors (see below), whose sum is σ = 33683785200. Its totient is φ = 7453827072.

The previous prime is 16399755949. The next prime is 16399755989. The reversal of 16399755976 is 67955799361.

It can be written as a sum of positive squares in 8 ways, for example, as 12039795076 + 4359960900 = 109726^2 + 66030^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 677490 + ... + 701278.

Almost surely, 2^16399755976 is an apocalyptic number.

It is an amenable number.

16399755976 is an abundant number, since it is smaller than the sum of its proper divisors (17284029224).

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

16399755976 is a wasteful number, since it uses less digits than its factorization.

16399755976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23986 (or 23982 counting only the distinct ones).

The product of its digits is 96446700, while the sum is 67.

The spelling of 16399755976 in words is "sixteen billion, three hundred ninety-nine million, seven hundred fifty-five thousand, nine hundred seventy-six".