18104551818 has 16 divisors (see below), whose sum is σ = 36667447680. Its totient is φ = 5958459936.

The previous prime is 18104551789. The next prime is 18104551841. The reversal of 18104551818 is 81815540181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18104551818.

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, 19097155 + ... + 19098102.

It is an arithmetic number, because the mean of its divisors is an integer number (2291715480).

Almost surely, 2^18104551818 is an apocalyptic number.

18104551818 is an abundant number, since it is smaller than the sum of its proper divisors (18562895862).

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

18104551818 is a wasteful number, since it uses less digits than its factorization.

18104551818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38195341.

The product of its (nonzero) digits is 51200, while the sum is 42.

The spelling of 18104551818 in words is "eighteen billion, one hundred four million, five hundred fifty-one thousand, eight hundred eighteen".