669515459 has 2 divisors, whose sum is σ = 669515460. Its totient is φ = 669515458.

The previous prime is 669515453. The next prime is 669515501. The reversal of 669515459 is 954515966.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669515459 - 2¹⁶ = 669449923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669515453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334757729 + 334757730.

It is an arithmetic number, because the mean of its divisors is an integer number (334757730).

Almost surely, 2^669515459 is an apocalyptic number.

669515459 is a deficient number, since it is larger than the sum of its proper divisors (1).

669515459 is an equidigital number, since it uses as much as digits as its factorization.

669515459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458000, while the sum is 50.

The square root of 669515459 is about 25874.9967922703. The cubic root of 669515459 is about 874.8230211860.

The spelling of 669515459 in words is "six hundred sixty-nine million, five hundred fifteen thousand, four hundred fifty-nine".