669624757 has 2 divisors, whose sum is σ = 669624758. Its totient is φ = 669624756.

The previous prime is 669624731. The next prime is 669624773. The reversal of 669624757 is 757426966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640798596 + 28826161 = 25314^2 + 5369^2 .

It is a cyclic number.

It is not a de Polignac number, because 669624757 - 2⁷ = 669624629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669624157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334812378 + 334812379.

It is an arithmetic number, because the mean of its divisors is an integer number (334812379).

Almost surely, 2^669624757 is an apocalyptic number.

It is an amenable number.

669624757 is a deficient number, since it is larger than the sum of its proper divisors (1).

669624757 is an equidigital number, since it uses as much as digits as its factorization.

669624757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 52.

The square root of 669624757 is about 25877.1087449893. The cubic root of 669624757 is about 874.8706233748.

The spelling of 669624757 in words is "six hundred sixty-nine million, six hundred twenty-four thousand, seven hundred fifty-seven".