664623299 has 4 divisors (see below), whose sum is σ = 665192040. Its totient is φ = 664054560.

The previous prime is 664623277. The next prime is 664623319. The reversal of 664623299 is 992326466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664623299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664623199) 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, 282614 + ... + 284955.

It is an arithmetic number, because the mean of its divisors is an integer number (166298010).

Almost surely, 2^664623299 is an apocalyptic number.

664623299 is a deficient number, since it is larger than the sum of its proper divisors (568741).

664623299 is a wasteful number, since it uses less digits than its factorization.

664623299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568740.

The product of its digits is 839808, while the sum is 47.

The square root of 664623299 is about 25780.2889626940. The cubic root of 664623299 is about 872.6870282661.

The spelling of 664623299 in words is "six hundred sixty-four million, six hundred twenty-three thousand, two hundred ninety-nine".