669015667 has 2 divisors, whose sum is σ = 669015668. Its totient is φ = 669015666.

The previous prime is 669015623. The next prime is 669015713. The reversal of 669015667 is 766510966.

It is an a-pointer prime, because the next prime (669015713) can be obtained adding 669015667 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669015667 - 2²³ = 660627059 is a prime.

It is not a weakly prime, because it can be changed into another prime (669015967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334507833 + 334507834.

It is an arithmetic number, because the mean of its divisors is an integer number (334507834).

Almost surely, 2^669015667 is an apocalyptic number.

669015667 is a deficient number, since it is larger than the sum of its proper divisors (1).

669015667 is an equidigital number, since it uses as much as digits as its factorization.

669015667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 669015667 is about 25865.3371715893. The cubic root of 669015667 is about 874.6052824300.

The spelling of 669015667 in words is "six hundred sixty-nine million, fifteen thousand, six hundred sixty-seven".