666711172 has 24 divisors (see below), whose sum is σ = 1216097792. Its totient is φ = 319464000.

The previous prime is 666711119. The next prime is 666711217. The reversal of 666711172 is 271117666.

666711172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×666711172² = 889007573739227168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13329 + ... + 38872.

Almost surely, 2^666711172 is an apocalyptic number.

666711172 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

666711172 is a deficient number, since it is larger than the sum of its proper divisors (549386620).

666711172 is a wasteful number, since it uses less digits than its factorization.

666711172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52339 (or 52337 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 666711172 is about 25820.7508024070. The cubic root of 666711172 is about 873.5999037986.

The spelling of 666711172 in words is "six hundred sixty-six million, seven hundred eleven thousand, one hundred seventy-two".