668259173 has 4 divisors (see below), whose sum is σ = 683800128. Its totient is φ = 652718220.

The previous prime is 668259143. The next prime is 668259187. The reversal of 668259173 is 371952866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668259173 - 2⁸ = 668258917 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 (668259143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7770413 + ... + 7770498.

It is an arithmetic number, because the mean of its divisors is an integer number (170950032).

Almost surely, 2^668259173 is an apocalyptic number.

It is an amenable number.

668259173 is a deficient number, since it is larger than the sum of its proper divisors (15540955).

668259173 is a wasteful number, since it uses less digits than its factorization.

668259173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15540954.

The product of its digits is 544320, while the sum is 47.

The square root of 668259173 is about 25850.7093326276. The cubic root of 668259173 is about 874.2755028148.

The spelling of 668259173 in words is "six hundred sixty-eight million, two hundred fifty-nine thousand, one hundred seventy-three".