668964931 has 2 divisors, whose sum is σ = 668964932. Its totient is φ = 668964930.

The previous prime is 668964929. The next prime is 668964971. The reversal of 668964931 is 139469866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668964931 - 2¹ = 668964929 is a prime.

It is a super-2 number, since 2×668964931² = 895028157815669522, which contains 22 as substring.

Together with 668964929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (668964971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334482465 + 334482466.

It is an arithmetic number, because the mean of its divisors is an integer number (334482466).

Almost surely, 2^668964931 is an apocalyptic number.

668964931 is a deficient number, since it is larger than the sum of its proper divisors (1).

668964931 is an equidigital number, since it uses as much as digits as its factorization.

668964931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 52.

The square root of 668964931 is about 25864.3563809347. The cubic root of 668964931 is about 874.5831727856.

The spelling of 668964931 in words is "six hundred sixty-eight million, nine hundred sixty-four thousand, nine hundred thirty-one".