667172512 has 12 divisors (see below), whose sum is σ = 1313495946. Its totient is φ = 333586240.

The previous prime is 667172507. The next prime is 667172549. The reversal of 667172512 is 215271766.

It can be written as a sum of positive squares in only one way, i.e., 642926736 + 24245776 = 25356^2 + 4924^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10424539 + ... + 10424602.

Almost surely, 2^667172512 is an apocalyptic number.

It is an amenable number.

667172512 is a deficient number, since it is larger than the sum of its proper divisors (646323434).

667172512 is a wasteful number, since it uses less digits than its factorization.

667172512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20849151 (or 20849143 counting only the distinct ones).

The product of its digits is 35280, while the sum is 37.

The square root of 667172512 is about 25829.6827700226. The cubic root of 667172512 is about 873.8013571777.

It can be divided in two parts, 66 and 7172512, that added together give a triangular number (7172578 = T₃₇₈₇).

The spelling of 667172512 in words is "six hundred sixty-seven million, one hundred seventy-two thousand, five hundred twelve".