669839057 has 2 divisors, whose sum is σ = 669839058. Its totient is φ = 669839056.

The previous prime is 669839047. The next prime is 669839077. The reversal of 669839057 is 750938966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497468416 + 172370641 = 22304^2 + 13129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669839057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669839047) 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, 334919528 + 334919529.

It is an arithmetic number, because the mean of its divisors is an integer number (334919529).

Almost surely, 2^669839057 is an apocalyptic number.

It is an amenable number.

669839057 is a deficient number, since it is larger than the sum of its proper divisors (1).

669839057 is an equidigital number, since it uses as much as digits as its factorization.

669839057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The square root of 669839057 is about 25881.2491390968. The cubic root of 669839057 is about 874.9639416977.

The spelling of 669839057 in words is "six hundred sixty-nine million, eight hundred thirty-nine thousand, fifty-seven".