668450005739 has 2 divisors, whose sum is σ = 668450005740. Its totient is φ = 668450005738.

The previous prime is 668450005703. The next prime is 668450005759. The reversal of 668450005739 is 937500054866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668450005739 - 2¹⁶ = 668449940203 is a prime.

It is a super-2 number, since 2×668450005739² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (668450005759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334225002869 + 334225002870.

It is an arithmetic number, because the mean of its divisors is an integer number (334225002870).

Almost surely, 2^668450005739 is an apocalyptic number.

668450005739 is a deficient number, since it is larger than the sum of its proper divisors (1).

668450005739 is an equidigital number, since it uses as much as digits as its factorization.

668450005739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 668450005739 in words is "six hundred sixty-eight billion, four hundred fifty million, five thousand, seven hundred thirty-nine".