16400386951680 has 80 divisors (see below), whose sum is σ = 52429987060704. Its totient is φ = 4373436518400.

The previous prime is 16400386951679. The next prime is 16400386951717. The reversal of 16400386951680 is 8615968300461.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 16400386951680.

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, 1067725846 + ... + 1067741205.

Almost surely, 2^{16400386951680} is an apocalyptic number.

16400386951680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16400386951680 is an abundant number, since it is smaller than the sum of its proper divisors (36029600109024).

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

16400386951680 is an equidigital number, since it uses as much as digits as its factorization.

16400386951680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135467077 (or 2135467061 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 57.

The spelling of 16400386951680 in words is "sixteen trillion, four hundred billion, three hundred eighty-six million, nine hundred fifty-one thousand, six hundred eighty".