66711172 has 36 divisors (see below), whose sum is σ = 129017980. Its totient is φ = 30159360.

The previous prime is 66711157. The next prime is 66711181. The reversal of 66711172 is 27111766.

It can be written as a sum of positive squares in 2 ways, for example, as 41550916 + 25160256 = 6446^2 + 5016^2 .

It is a super-2 number, since 2×66711172² = 8900760939227168, which contains 22 as substring.

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, 162904 + ... + 163312.

Almost surely, 2^66711172 is an apocalyptic number.

It is an amenable number.

66711172 is a deficient number, since it is larger than the sum of its proper divisors (62306808).

66711172 is a wasteful number, since it uses less digits than its factorization.

66711172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 759 counting only the distinct ones).

The product of its digits is 3528, while the sum is 31.

The square root of 66711172 is about 8167.6907385135. The cubic root of 66711172 is about 405.5703431095.

The spelling of 66711172 in words is "sixty-six million, seven hundred eleven thousand, one hundred seventy-two".