669015791 has 2 divisors, whose sum is σ = 669015792. Its totient is φ = 669015790.

The previous prime is 669015749. The next prime is 669015793. The reversal of 669015791 is 197510966.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669015791 - 2²⁶ = 601906927 is a prime.

Together with 669015793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669015793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334507895 + 334507896.

It is an arithmetic number, because the mean of its divisors is an integer number (334507896).

Almost surely, 2^669015791 is an apocalyptic number.

669015791 is a deficient number, since it is larger than the sum of its proper divisors (1).

669015791 is an equidigital number, since it uses as much as digits as its factorization.

669015791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 669015791 is about 25865.3395686196. The cubic root of 669015791 is about 874.6053364651.

The spelling of 669015791 in words is "six hundred sixty-nine million, fifteen thousand, seven hundred ninety-one".