664868307 has 6 divisors (see below), whose sum is σ = 886550628. Its totient is φ = 443215764.

The previous prime is 664868287. The next prime is 664868333. The reversal of 664868307 is 703868466.

It is a happy number.

664868307 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664868307 - 2⁷ = 664868179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664868507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37218 + ... + 52104.

It is an arithmetic number, because the mean of its divisors is an integer number (147758438).

Almost surely, 2^664868307 is an apocalyptic number.

664868307 is a deficient number, since it is larger than the sum of its proper divisors (221682321).

664868307 is an frugal number, since it uses more digits than its factorization.

664868307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29777 (or 14890 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 664868307 is about 25785.0403722779. The cubic root of 664868307 is about 872.7942514281.

Multiplying 664868307 by its sum of digits (48), we get a square (31913678736 = 178644²).

The spelling of 664868307 in words is "six hundred sixty-four million, eight hundred sixty-eight thousand, three hundred seven".