18193251156 has 24 divisors (see below), whose sum is σ = 42506143680. Its totient is φ = 6056527872.

The previous prime is 18193251143. The next prime is 18193251173. The reversal of 18193251156 is 65115239181.

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 7 ways as a sum of consecutive naturals, for example, 976536 + ... + 994991.

It is an arithmetic number, because the mean of its divisors is an integer number (1771089320).

Almost surely, 2^18193251156 is an apocalyptic number.

It is an amenable number.

18193251156 is an abundant number, since it is smaller than the sum of its proper divisors (24312892524).

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

18193251156 is a wasteful number, since it uses less digits than its factorization.

18193251156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972303 (or 1972301 counting only the distinct ones).

The product of its digits is 64800, while the sum is 42.

The spelling of 18193251156 in words is "eighteen billion, one hundred ninety-three million, two hundred fifty-one thousand, one hundred fifty-six".