669258449 has 2 divisors, whose sum is σ = 669258450. Its totient is φ = 669258448.

The previous prime is 669258437. The next prime is 669258503. The reversal of 669258449 is 944852966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474934849 + 194323600 = 21793^2 + 13940^2 .

It is a cyclic number.

It is not a de Polignac number, because 669258449 - 2¹² = 669254353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 669258449.

It is not a weakly prime, because it can be changed into another prime (669258409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334629224 + 334629225.

It is an arithmetic number, because the mean of its divisors is an integer number (334629225).

Almost surely, 2^669258449 is an apocalyptic number.

It is an amenable number.

669258449 is a deficient number, since it is larger than the sum of its proper divisors (1).

669258449 is an equidigital number, since it uses as much as digits as its factorization.

669258449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 53.

The square root of 669258449 is about 25870.0299381350. The cubic root of 669258449 is about 874.7110660710.

The spelling of 669258449 in words is "six hundred sixty-nine million, two hundred fifty-eight thousand, four hundred forty-nine".