669757357 has 2 divisors, whose sum is σ = 669757358. Its totient is φ = 669757356.

The previous prime is 669757337. The next prime is 669757399. The reversal of 669757357 is 753757966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 612513001 + 57244356 = 24749^2 + 7566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669757357 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 669757298 and 669757307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669757337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334878678 + 334878679.

It is an arithmetic number, because the mean of its divisors is an integer number (334878679).

Almost surely, 2^669757357 is an apocalyptic number.

It is an amenable number.

669757357 is a deficient number, since it is larger than the sum of its proper divisors (1).

669757357 is an equidigital number, since it uses as much as digits as its factorization.

669757357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8334900, while the sum is 55.

The square root of 669757357 is about 25879.6707281990. The cubic root of 669757357 is about 874.9283672515.

The spelling of 669757357 in words is "six hundred sixty-nine million, seven hundred fifty-seven thousand, three hundred fifty-seven".