18953872506 has 20 divisors (see below), whose sum is σ = 42470714682. Its totient is φ = 6317957448.

The previous prime is 18953872489. The next prime is 18953872507. The reversal of 18953872506 is 60527835981.

18953872506 is a `hidden beast` number, since 1 + 8 + 9 + 5 + 387 + 250 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17859916881 + 1093955625 = 133641^2 + 33075^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18953872507) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 58499445 + ... + 58499768.

Almost surely, 2^18953872506 is an apocalyptic number.

18953872506 is an abundant number, since it is smaller than the sum of its proper divisors (23516842176).

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

18953872506 is a wasteful number, since it uses less digits than its factorization.

18953872506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116999227 (or 116999218 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 18953872506 in words is "eighteen billion, nine hundred fifty-three million, eight hundred seventy-two thousand, five hundred six".