669015049 has 2 divisors, whose sum is σ = 669015050. Its totient is φ = 669015048.

The previous prime is 669015043. The next prime is 669015073. The reversal of 669015049 is 940510966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659205625 + 9809424 = 25675^2 + 3132^2 .

It is a cyclic number.

It is not a de Polignac number, because 669015049 - 2³ = 669015041 is a prime.

It is a super-2 number, since 2×669015049² = 895162271576944802, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669015041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334507524 + 334507525.

It is an arithmetic number, because the mean of its divisors is an integer number (334507525).

Almost surely, 2^669015049 is an apocalyptic number.

It is an amenable number.

669015049 is a deficient number, since it is larger than the sum of its proper divisors (1).

669015049 is an equidigital number, since it uses as much as digits as its factorization.

669015049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 669015049 is about 25865.3252250962. The cubic root of 669015049 is about 874.6050131258.

The spelling of 669015049 in words is "six hundred sixty-nine million, fifteen thousand, forty-nine".