668904173 has 8 divisors (see below), whose sum is σ = 782240448. Its totient is φ = 560012544.

The previous prime is 668904163. The next prime is 668904211. The reversal of 668904173 is 371409866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668904173 - 2⁴ = 668904157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668904133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110836 + ... + 1111437.

It is an arithmetic number, because the mean of its divisors is an integer number (97780056).

Almost surely, 2^668904173 is an apocalyptic number.

It is an amenable number.

668904173 is a deficient number, since it is larger than the sum of its proper divisors (113336275).

668904173 is a wasteful number, since it uses less digits than its factorization.

668904173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222323.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 668904173 is about 25863.1818034827. The cubic root of 668904173 is about 874.5566943009.

The spelling of 668904173 in words is "six hundred sixty-eight million, nine hundred four thousand, one hundred seventy-three".