664359931 has 2 divisors, whose sum is σ = 664359932. Its totient is φ = 664359930.

The previous prime is 664359911. The next prime is 664359937. The reversal of 664359931 is 139953466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664359931 is a prime.

It is a super-4 number, since 4×664359931⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (664359937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332179965 + 332179966.

It is an arithmetic number, because the mean of its divisors is an integer number (332179966).

Almost surely, 2^664359931 is an apocalyptic number.

664359931 is a deficient number, since it is larger than the sum of its proper divisors (1).

664359931 is an equidigital number, since it uses as much as digits as its factorization.

664359931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 46.

The square root of 664359931 is about 25775.1805231312. The cubic root of 664359931 is about 872.5717408026.

The spelling of 664359931 in words is "six hundred sixty-four million, three hundred fifty-nine thousand, nine hundred thirty-one".