18400786856 has 16 divisors (see below), whose sum is σ = 34505563200. Its totient is φ = 9199303344.

The previous prime is 18400786843. The next prime is 18400786883. The reversal of 18400786856 is 65868700481.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18400786798 and 18400786807.

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, 62150 + ... + 201653.

It is an arithmetic number, because the mean of its divisors is an integer number (2156597700).

Almost surely, 2^18400786856 is an apocalyptic number.

It is an amenable number.

18400786856 is a deficient number, since it is larger than the sum of its proper divisors (16104776344).

18400786856 is a wasteful number, since it uses less digits than its factorization.

18400786856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272528 (or 272524 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 53.

The spelling of 18400786856 in words is "eighteen billion, four hundred million, seven hundred eighty-six thousand, eight hundred fifty-six".