664223173 has 4 divisors (see below), whose sum is σ = 665387008. Its totient is φ = 663059340.

The previous prime is 664223171. The next prime is 664223177. The reversal of 664223173 is 371322466.

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 664223173 - 2¹ = 664223171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664223171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581061 + ... + 582202.

It is an arithmetic number, because the mean of its divisors is an integer number (166346752).

Almost surely, 2^664223173 is an apocalyptic number.

It is an amenable number.

664223173 is a deficient number, since it is larger than the sum of its proper divisors (1163835).

664223173 is a wasteful number, since it uses less digits than its factorization.

664223173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163834.

The product of its digits is 36288, while the sum is 34.

The square root of 664223173 is about 25772.5274856775. The cubic root of 664223173 is about 872.5118639449.

The spelling of 664223173 in words is "six hundred sixty-four million, two hundred twenty-three thousand, one hundred seventy-three".