16404689856 has 28 divisors (see below), whose sum is σ = 43404075752. Its totient is φ = 5468229888.

The previous prime is 16404689843. The next prime is 16404689887. The reversal of 16404689856 is 65898640461.

It is a super-2 number, since 2×16404689856² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16404689796 and 16404689805.

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, 42720355 + ... + 42720738.

Almost surely, 2^16404689856 is an apocalyptic number.

16404689856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16404689856 is an abundant number, since it is smaller than the sum of its proper divisors (26999385896).

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

16404689856 is an equidigital number, since it uses as much as digits as its factorization.

16404689856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85441108 (or 85441098 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 57.

The spelling of 16404689856 in words is "sixteen billion, four hundred four million, six hundred eighty-nine thousand, eight hundred fifty-six".