664223615 has 8 divisors (see below), whose sum is σ = 869529168. Its totient is φ = 483071680.

The previous prime is 664223611. The next prime is 664223621. The reversal of 664223615 is 516322466.

It is a happy number.

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

It is not a de Polignac number, because 664223615 - 2² = 664223611 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 (664223611) 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, 6038342 + ... + 6038451.

It is an arithmetic number, because the mean of its divisors is an integer number (108691146).

Almost surely, 2^664223615 is an apocalyptic number.

664223615 is a deficient number, since it is larger than the sum of its proper divisors (205305553).

664223615 is a wasteful number, since it uses less digits than its factorization.

664223615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12076809.

The product of its digits is 51840, while the sum is 35.

The square root of 664223615 is about 25772.5360606984. The cubic root of 664223615 is about 872.5120574793.

The spelling of 664223615 in words is "six hundred sixty-four million, two hundred twenty-three thousand, six hundred fifteen".