18356456208 has 20 divisors (see below), whose sum is σ = 47420845328. Its totient is φ = 6118818720.

The previous prime is 18356456207. The next prime is 18356456267. The reversal of 18356456208 is 80265465381.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 382426171 = 18356456208 / (1 + 8 + 3 + 5 + 6 + 4 + 5 + 6 + 2 + 0 + 8).

It is not an unprimeable number, because it can be changed into a prime (18356456207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191213038 + ... + 191213133.

Almost surely, 2^18356456208 is an apocalyptic number.

It is an amenable number.

18356456208 is an abundant number, since it is smaller than the sum of its proper divisors (29064389120).

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

18356456208 is a wasteful number, since it uses less digits than its factorization.

18356456208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382426182 (or 382426176 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 18356456208 in words is "eighteen billion, three hundred fifty-six million, four hundred fifty-six thousand, two hundred eight".