669646597 has 2 divisors, whose sum is σ = 669646598. Its totient is φ = 669646596.

The previous prime is 669646589. The next prime is 669646613. The reversal of 669646597 is 795646966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 545969956 + 123676641 = 23366^2 + 11121^2 .

It is a cyclic number.

It is not a de Polignac number, because 669646597 - 2³ = 669646589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669646517) 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, 334823298 + 334823299.

It is an arithmetic number, because the mean of its divisors is an integer number (334823299).

Almost surely, 2^669646597 is an apocalyptic number.

It is an amenable number.

669646597 is a deficient number, since it is larger than the sum of its proper divisors (1).

669646597 is an equidigital number, since it uses as much as digits as its factorization.

669646597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 58.

The square root of 669646597 is about 25877.5307361425. The cubic root of 669646597 is about 874.8801346554.

The spelling of 669646597 in words is "six hundred sixty-nine million, six hundred forty-six thousand, five hundred ninety-seven".