669637069 has 2 divisors, whose sum is σ = 669637070. Its totient is φ = 669637068.

The previous prime is 669637049. The next prime is 669637099. The reversal of 669637069 is 960736966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663732169 + 5904900 = 25763^2 + 2430^2 .

It is a cyclic number.

It is not a de Polignac number, because 669637069 - 2⁵ = 669637037 is a prime.

It is a super-2 number, since 2×669637069² = 896827608357821522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669637049) 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, 334818534 + 334818535.

It is an arithmetic number, because the mean of its divisors is an integer number (334818535).

Almost surely, 2^669637069 is an apocalyptic number.

It is an amenable number.

669637069 is a deficient number, since it is larger than the sum of its proper divisors (1).

669637069 is an equidigital number, since it uses as much as digits as its factorization.

669637069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 52.

The square root of 669637069 is about 25877.3466375515. The cubic root of 669637069 is about 874.8759852540.

The spelling of 669637069 in words is "six hundred sixty-nine million, six hundred thirty-seven thousand, sixty-nine".