18666895956 has 48 divisors (see below), whose sum is σ = 45960566400. Its totient is φ = 5884882432.

The previous prime is 18666895939. The next prime is 18666895957. The reversal of 18666895956 is 65959866681.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18666895957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355401 + ... + 404528.

It is an arithmetic number, because the mean of its divisors is an integer number (957511800).

Almost surely, 2^18666895956 is an apocalyptic number.

It is an amenable number.

18666895956 is an abundant number, since it is smaller than the sum of its proper divisors (27293670444).

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

18666895956 is a wasteful number, since it uses less digits than its factorization.

18666895956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760048 (or 760046 counting only the distinct ones).

The product of its digits is 167961600, while the sum is 69.

The spelling of 18666895956 in words is "eighteen billion, six hundred sixty-six million, eight hundred ninety-five thousand, nine hundred fifty-six".