669766723 has 2 divisors, whose sum is σ = 669766724. Its totient is φ = 669766722.

The previous prime is 669766681. The next prime is 669766759. The reversal of 669766723 is 327667966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669766723 - 2⁹ = 669766211 is a prime.

It is not a weakly prime, because it can be changed into another prime (669766423) 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, 334883361 + 334883362.

It is an arithmetic number, because the mean of its divisors is an integer number (334883362).

Almost surely, 2^669766723 is an apocalyptic number.

669766723 is a deficient number, since it is larger than the sum of its proper divisors (1).

669766723 is an equidigital number, since it uses as much as digits as its factorization.

669766723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 52.

The square root of 669766723 is about 25879.8516804096. The cubic root of 669766723 is about 874.9324456145.

The spelling of 669766723 in words is "six hundred sixty-nine million, seven hundred sixty-six thousand, seven hundred twenty-three".