18189890696 has 8 divisors (see below), whose sum is σ = 34106045070. Its totient is φ = 9094945344.

The previous prime is 18189890689. The next prime is 18189890767. The reversal of 18189890696 is 69609898181.

It can be written as a sum of positive squares in only one way, i.e., 14001988900 + 4187901796 = 118330^2 + 64714^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1136868161 + ... + 1136868176.

Almost surely, 2^18189890696 is an apocalyptic number.

It is an amenable number.

18189890696 is a deficient number, since it is larger than the sum of its proper divisors (15916154374).

18189890696 is a wasteful number, since it uses less digits than its factorization.

18189890696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273736343 (or 2273736339 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 65.

The spelling of 18189890696 in words is "eighteen billion, one hundred eighty-nine million, eight hundred ninety thousand, six hundred ninety-six".