669023689 has 2 divisors, whose sum is σ = 669023690. Its totient is φ = 669023688.

The previous prime is 669023671. The next prime is 669023723. The reversal of 669023689 is 986320966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668739600 + 284089 = 25860^2 + 533^2 .

It is a cyclic number.

It is not a de Polignac number, because 669023689 - 2¹³ = 669015497 is a prime.

It is not a weakly prime, because it can be changed into another prime (669023639) 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, 334511844 + 334511845.

It is an arithmetic number, because the mean of its divisors is an integer number (334511845).

Almost surely, 2^669023689 is an apocalyptic number.

It is an amenable number.

669023689 is a deficient number, since it is larger than the sum of its proper divisors (1).

669023689 is an equidigital number, since it uses as much as digits as its factorization.

669023689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 669023689 is about 25865.4922435279. The cubic root of 669023689 is about 874.6087781406.

The spelling of 669023689 in words is "six hundred sixty-nine million, twenty-three thousand, six hundred eighty-nine".