668892547937 has 2 divisors, whose sum is σ = 668892547938. Its totient is φ = 668892547936.

The previous prime is 668892547819. The next prime is 668892547987. The reversal of 668892547937 is 739745298866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564074600401 + 104817947536 = 751049^2 + 323756^2 .

It is a cyclic number.

It is not a de Polignac number, because 668892547937 - 2¹⁰ = 668892546913 is a prime.

It is not a weakly prime, because it can be changed into another prime (668892547987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334446273968 + 334446273969.

It is an arithmetic number, because the mean of its divisors is an integer number (334446273969).

Almost surely, 2^668892547937 is an apocalyptic number.

It is an amenable number.

668892547937 is a deficient number, since it is larger than the sum of its proper divisors (1).

668892547937 is an equidigital number, since it uses as much as digits as its factorization.

668892547937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1097349120, while the sum is 74.

The spelling of 668892547937 in words is "six hundred sixty-eight billion, eight hundred ninety-two million, five hundred forty-seven thousand, nine hundred thirty-seven".