669649313 has 2 divisors, whose sum is σ = 669649314. Its totient is φ = 669649312.

The previous prime is 669649303. The next prime is 669649327. The reversal of 669649313 is 313946966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631617424 + 38031889 = 25132^2 + 6167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669649313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669649303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334824656 + 334824657.

It is an arithmetic number, because the mean of its divisors is an integer number (334824657).

Almost surely, 2^669649313 is an apocalyptic number.

It is an amenable number.

669649313 is a deficient number, since it is larger than the sum of its proper divisors (1).

669649313 is an equidigital number, since it uses as much as digits as its factorization.

669649313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 47.

The square root of 669649313 is about 25877.5832140484. The cubic root of 669649313 is about 874.8813174540.

The spelling of 669649313 in words is "six hundred sixty-nine million, six hundred forty-nine thousand, three hundred thirteen".