18918890864 has 20 divisors (see below), whose sum is σ = 37033244304. Its totient is φ = 9361924608.

The previous prime is 18918890819. The next prime is 18918890899. The reversal of 18918890864 is 46809881981.

It is a junction number, because it is equal to n+sod(n) for n = 18918890797 and 18918890806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6093452 + ... + 6096555.

Almost surely, 2^18918890864 is an apocalyptic number.

It is an amenable number.

18918890864 is a deficient number, since it is larger than the sum of its proper divisors (18114353440).

18918890864 is a wasteful number, since it uses less digits than its factorization.

18918890864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12190112 (or 12190106 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 62.

The spelling of 18918890864 in words is "eighteen billion, nine hundred eighteen million, eight hundred ninety thousand, eight hundred sixty-four".