66670172 has 12 divisors (see below), whose sum is σ = 117043080. Its totient is φ = 33229296.

The previous prime is 66670157. The next prime is 66670187. The reversal of 66670172 is 27107666.

It is an interprime number because it is at equal distance from previous prime (66670157) and next prime (66670187).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25022 + ... + 27557.

It is an arithmetic number, because the mean of its divisors is an integer number (9753590).

Almost surely, 2^66670172 is an apocalyptic number.

It is an amenable number.

66670172 is a deficient number, since it is larger than the sum of its proper divisors (50372908).

66670172 is a wasteful number, since it uses less digits than its factorization.

66670172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52900 (or 52898 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 66670172 is about 8165.1804634068. The cubic root of 66670172 is about 405.4872396288.

The spelling of 66670172 in words is "sixty-six million, six hundred seventy thousand, one hundred seventy-two".