668170172 has 6 divisors (see below), whose sum is σ = 1169297808. Its totient is φ = 334085084.

The previous prime is 668170157. The next prime is 668170183. The reversal of 668170172 is 271071866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83521268 + ... + 83521275.

It is an arithmetic number, because the mean of its divisors is an integer number (194882968).

Almost surely, 2^668170172 is an apocalyptic number.

It is an amenable number.

668170172 is a deficient number, since it is larger than the sum of its proper divisors (501127636).

668170172 is a wasteful number, since it uses less digits than its factorization.

668170172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167042547 (or 167042545 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 668170172 is about 25848.9878331822. The cubic root of 668170172 is about 874.2366881095.

The spelling of 668170172 in words is "six hundred sixty-eight million, one hundred seventy thousand, one hundred seventy-two".