664754623 has 8 divisors (see below), whose sum is σ = 717054800. Its totient is φ = 612620928.

The previous prime is 664754603. The next prime is 664754641. The reversal of 664754623 is 326457466.

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

It is a cyclic number.

It is not a de Polignac number, because 664754623 - 2¹³ = 664746431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664754623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664754603) 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, 33258 + ... + 49351.

It is an arithmetic number, because the mean of its divisors is an integer number (89631850).

Almost surely, 2^664754623 is an apocalyptic number.

664754623 is a deficient number, since it is larger than the sum of its proper divisors (52300177).

664754623 is a wasteful number, since it uses less digits than its factorization.

664754623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83241.

The product of its digits is 725760, while the sum is 43.

The square root of 664754623 is about 25782.8358215306. The cubic root of 664754623 is about 872.7445030311.

The spelling of 664754623 in words is "six hundred sixty-four million, seven hundred fifty-four thousand, six hundred twenty-three".