18886813156 has 12 divisors (see below), whose sum is σ = 33219700668. Its totient is φ = 9395470112.

The previous prime is 18886813129. The next prime is 18886813171. The reversal of 18886813156 is 65131868881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9480916900 + 9405896256 = 97370^2 + 96984^2 .

It is a super-2 number, since 2×18886813156² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18886813097 and 18886813106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11983231 + ... + 11984806.

It is an arithmetic number, because the mean of its divisors is an integer number (2768308389).

Almost surely, 2^18886813156 is an apocalyptic number.

It is an amenable number.

18886813156 is a deficient number, since it is larger than the sum of its proper divisors (14332887512).

18886813156 is a wasteful number, since it uses less digits than its factorization.

18886813156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23968238 (or 23968236 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 55.

The spelling of 18886813156 in words is "eighteen billion, eight hundred eighty-six million, eight hundred thirteen thousand, one hundred fifty-six".