669481082964709 has 2 divisors, whose sum is σ = 669481082964710. Its totient is φ = 669481082964708.

The previous prime is 669481082964691. The next prime is 669481082964731. The reversal of 669481082964709 is 907469280184966.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 557061248601025 + 112419834363684 = 23602145^2 + 10602822^2 .

It is a cyclic number.

It is not a de Polignac number, because 669481082964709 - 2²³ = 669481074576101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669481082967709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334740541482354 + 334740541482355.

It is an arithmetic number, because the mean of its divisors is an integer number (334740541482355).

Almost surely, 2^{669481082964709} is an apocalyptic number.

It is an amenable number.

669481082964709 is a deficient number, since it is larger than the sum of its proper divisors (1).

669481082964709 is an equidigital number, since it uses as much as digits as its factorization.

669481082964709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2257403904, while the sum is 79.

The spelling of 669481082964709 in words is "six hundred sixty-nine trillion, four hundred eighty-one billion, eighty-two million, nine hundred sixty-four thousand, seven hundred nine".