669020959 has 2 divisors, whose sum is σ = 669020960. Its totient is φ = 669020958.

The previous prime is 669020927. The next prime is 669020971. The reversal of 669020959 is 959020966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669020959 - 2⁵ = 669020927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669020909) 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, 334510479 + 334510480.

It is an arithmetic number, because the mean of its divisors is an integer number (334510480).

Almost surely, 2^669020959 is an apocalyptic number.

669020959 is a deficient number, since it is larger than the sum of its proper divisors (1).

669020959 is an equidigital number, since it uses as much as digits as its factorization.

669020959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 669020959 is about 25865.4394704594. The cubic root of 669020959 is about 874.6075885040.

The spelling of 669020959 in words is "six hundred sixty-nine million, twenty thousand, nine hundred fifty-nine".