669023723 has 2 divisors, whose sum is σ = 669023724. Its totient is φ = 669023722.

The previous prime is 669023689. The next prime is 669023737. The reversal of 669023723 is 327320966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669023723 - 2⁶ = 669023659 is a prime.

It is not a weakly prime, because it can be changed into another prime (669023753) 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, 334511861 + 334511862.

It is an arithmetic number, because the mean of its divisors is an integer number (334511862).

Almost surely, 2^669023723 is an apocalyptic number.

669023723 is a deficient number, since it is larger than the sum of its proper divisors (1).

669023723 is an equidigital number, since it uses as much as digits as its factorization.

669023723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 669023723 is about 25865.4929007742. The cubic root of 669023723 is about 874.6087929566.

The spelling of 669023723 in words is "six hundred sixty-nine million, twenty-three thousand, seven hundred twenty-three".