668972977019 has 2 divisors, whose sum is σ = 668972977020. Its totient is φ = 668972977018.

The previous prime is 668972976977. The next prime is 668972977021. The reversal of 668972977019 is 910779279866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668972977019 - 2²⁴ = 668956199803 is a prime.

It is a super-2 number, since 2×668972977019² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 668972977021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668972977219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334486488509 + 334486488510.

It is an arithmetic number, because the mean of its divisors is an integer number (334486488510).

Almost surely, 2^668972977019 is an apocalyptic number.

668972977019 is a deficient number, since it is larger than the sum of its proper divisors (1).

668972977019 is an equidigital number, since it uses as much as digits as its factorization.

668972977019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144027072, while the sum is 71.

The spelling of 668972977019 in words is "six hundred sixty-eight billion, nine hundred seventy-two million, nine hundred seventy-seven thousand, nineteen".