669428659 has 2 divisors, whose sum is σ = 669428660. Its totient is φ = 669428658.

The previous prime is 669428651. The next prime is 669428713. The reversal of 669428659 is 956824966.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669428659 - 2³ = 669428651 is a prime.

It is not a weakly prime, because it can be changed into another prime (669428651) 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, 334714329 + 334714330.

It is an arithmetic number, because the mean of its divisors is an integer number (334714330).

Almost surely, 2^669428659 is an apocalyptic number.

669428659 is a deficient number, since it is larger than the sum of its proper divisors (1).

669428659 is an equidigital number, since it uses as much as digits as its factorization.

669428659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 55.

The square root of 669428659 is about 25873.3194430092. The cubic root of 669428659 is about 874.7852137842.

It can be divided in two parts, 6694 and 28659, that added together give a palindrome (35353).

The spelling of 669428659 in words is "six hundred sixty-nine million, four hundred twenty-eight thousand, six hundred fifty-nine".