66171188916 has 36 divisors (see below), whose sum is σ = 191161213152. Its totient is φ = 18906053904.

The previous prime is 66171188891. The next prime is 66171188921. The reversal of 66171188916 is 61988117166.

66171188916 is a `hidden beast` number, since 6 + 617 + 1 + 1 + 8 + 8 + 9 + 16 = 666.

66171188916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×66171188916² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131291790 + ... + 131292293.

Almost surely, 2^66171188916 is an apocalyptic number.

It is an amenable number.

66171188916 is an abundant number, since it is smaller than the sum of its proper divisors (124990024236).

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

66171188916 is a wasteful number, since it uses less digits than its factorization.

66171188916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262584100 (or 262584095 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The spelling of 66171188916 in words is "sixty-six billion, one hundred seventy-one million, one hundred eighty-eight thousand, nine hundred sixteen".