16396409856 has 44 divisors (see below), whose sum is σ = 43702418312. Its totient is φ = 5465468928.

The previous prime is 16396409839. The next prime is 16396409873. The reversal of 16396409856 is 65890469361.

It is an interprime number because it is at equal distance from previous prime (16396409839) and next prime (16396409873).

It is a junction number, because it is equal to n+sod(n) for n = 16396409796 and 16396409805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2665615 + ... + 2671758.

Almost surely, 2^16396409856 is an apocalyptic number.

16396409856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16396409856 is an abundant number, since it is smaller than the sum of its proper divisors (27306008456).

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

16396409856 is an equidigital number, since it uses as much as digits as its factorization.

16396409856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5337396 (or 5337378 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 57.

The spelling of 16396409856 in words is "sixteen billion, three hundred ninety-six million, four hundred nine thousand, eight hundred fifty-six".