669499757 has 2 divisors, whose sum is σ = 669499758. Its totient is φ = 669499756.

The previous prime is 669499693. The next prime is 669499769. The reversal of 669499757 is 757994966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 348158281 + 321341476 = 18659^2 + 17926^2 .

It is a cyclic number.

It is not a de Polignac number, because 669499757 - 2⁶ = 669499693 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669499757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669499057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334749878 + 334749879.

It is an arithmetic number, because the mean of its divisors is an integer number (334749879).

Almost surely, 2^669499757 is an apocalyptic number.

It is an amenable number.

669499757 is a deficient number, since it is larger than the sum of its proper divisors (1).

669499757 is an equidigital number, since it uses as much as digits as its factorization.

669499757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25719120, while the sum is 62.

The square root of 669499757 is about 25874.6933701638. The cubic root of 669499757 is about 874.8161821214.

The spelling of 669499757 in words is "six hundred sixty-nine million, four hundred ninety-nine thousand, seven hundred fifty-seven".