669015749 has 2 divisors, whose sum is σ = 669015750. Its totient is φ = 669015748.

The previous prime is 669015713. The next prime is 669015791. The reversal of 669015749 is 947510966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 496487524 + 172528225 = 22282^2 + 13135^2 .

It is a cyclic number.

It is not a de Polignac number, because 669015749 - 2⁸ = 669015493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669015049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334507874 + 334507875.

It is an arithmetic number, because the mean of its divisors is an integer number (334507875).

Almost surely, 2^669015749 is an apocalyptic number.

It is an amenable number.

669015749 is a deficient number, since it is larger than the sum of its proper divisors (1).

669015749 is an equidigital number, since it uses as much as digits as its factorization.

669015749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 669015749 is about 25865.3387567223. The cubic root of 669015749 is about 874.6053181629.

The spelling of 669015749 in words is "six hundred sixty-nine million, fifteen thousand, seven hundred forty-nine".