18870785156 has 12 divisors (see below), whose sum is σ = 33024881820. Its totient is φ = 9435104640.

The previous prime is 18870785117. The next prime is 18870785189. The reversal of 18870785156 is 65158707881.

It can be written as a sum of positive squares in 2 ways, for example, as 12977766400 + 5893018756 = 113920^2 + 76766^2 .

It is a super-2 number, since 2×18870785156² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155000 + ... + 248528.

It is an arithmetic number, because the mean of its divisors is an integer number (2752073485).

Almost surely, 2^18870785156 is an apocalyptic number.

It is an amenable number.

18870785156 is a deficient number, since it is larger than the sum of its proper divisors (14154096664).

18870785156 is a wasteful number, since it uses less digits than its factorization.

18870785156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143974 (or 143972 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 56.

The spelling of 18870785156 in words is "eighteen billion, eight hundred seventy million, seven hundred eighty-five thousand, one hundred fifty-six".