669081577 has 2 divisors, whose sum is σ = 669081578. Its totient is φ = 669081576.

The previous prime is 669081557. The next prime is 669081607. The reversal of 669081577 is 775180966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344325136 + 324756441 = 18556^2 + 18021^2 .

It is a cyclic number.

It is not a de Polignac number, because 669081577 - 2⁷ = 669081449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669081577.

It is not a weakly prime, because it can be changed into another prime (669081527) 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, 334540788 + 334540789.

It is an arithmetic number, because the mean of its divisors is an integer number (334540789).

Almost surely, 2^669081577 is an apocalyptic number.

It is an amenable number.

669081577 is a deficient number, since it is larger than the sum of its proper divisors (1).

669081577 is an equidigital number, since it uses as much as digits as its factorization.

669081577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 669081577 is about 25866.6112392018. The cubic root of 669081577 is about 874.6340029040.

The spelling of 669081577 in words is "six hundred sixty-nine million, eighty-one thousand, five hundred seventy-seven".