668737324999 has 2 divisors, whose sum is σ = 668737325000. Its totient is φ = 668737324998.

The previous prime is 668737324979. The next prime is 668737325027. The reversal of 668737324999 is 999423737866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668737324999 - 2⁵ = 668737324967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668737324979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334368662499 + 334368662500.

It is an arithmetic number, because the mean of its divisors is an integer number (334368662500).

Almost surely, 2^668737324999 is an apocalyptic number.

668737324999 is a deficient number, since it is larger than the sum of its proper divisors (1).

668737324999 is an equidigital number, since it uses as much as digits as its factorization.

668737324999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740710656, while the sum is 73.

The spelling of 668737324999 in words is "six hundred sixty-eight billion, seven hundred thirty-seven million, three hundred twenty-four thousand, nine hundred ninety-nine".