668007397 has 2 divisors, whose sum is σ = 668007398. Its totient is φ = 668007396.

The previous prime is 668007341. The next prime is 668007419. The reversal of 668007397 is 793700866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435932641 + 232074756 = 20879^2 + 15234^2 .

It is a cyclic number.

It is not a de Polignac number, because 668007397 - 2⁷ = 668007269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668007317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334003698 + 334003699.

It is an arithmetic number, because the mean of its divisors is an integer number (334003699).

Almost surely, 2^668007397 is an apocalyptic number.

It is an amenable number.

668007397 is a deficient number, since it is larger than the sum of its proper divisors (1).

668007397 is an equidigital number, since it uses as much as digits as its factorization.

668007397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 668007397 is about 25845.8390655053. The cubic root of 668007397 is about 874.1656905103.

The spelling of 668007397 in words is "six hundred sixty-eight million, seven thousand, three hundred ninety-seven".