668009954629 has 2 divisors, whose sum is σ = 668009954630. Its totient is φ = 668009954628.

The previous prime is 668009954581. The next prime is 668009954659. The reversal of 668009954629 is 926459900866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353959553025 + 314050401604 = 594945^2 + 560402^2 .

It is a cyclic number.

It is not a de Polignac number, because 668009954629 - 2⁷ = 668009954501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668009954659) 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, 334004977314 + 334004977315.

It is an arithmetic number, because the mean of its divisors is an integer number (334004977315).

Almost surely, 2^668009954629 is an apocalyptic number.

It is an amenable number.

668009954629 is a deficient number, since it is larger than the sum of its proper divisors (1).

668009954629 is an equidigital number, since it uses as much as digits as its factorization.

668009954629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50388480, while the sum is 64.

The spelling of 668009954629 in words is "six hundred sixty-eight billion, nine million, nine hundred fifty-four thousand, six hundred twenty-nine".