669634241 has 2 divisors, whose sum is σ = 669634242. Its totient is φ = 669634240.

The previous prime is 669634223. The next prime is 669634279. The reversal of 669634241 is 142436966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666672400 + 2961841 = 25820^2 + 1721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669634241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669634291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334817120 + 334817121.

It is an arithmetic number, because the mean of its divisors is an integer number (334817121).

Almost surely, 2^669634241 is an apocalyptic number.

It is an amenable number.

669634241 is a deficient number, since it is larger than the sum of its proper divisors (1).

669634241 is an equidigital number, since it uses as much as digits as its factorization.

669634241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 41.

The square root of 669634241 is about 25877.2919951064. The cubic root of 669634241 is about 874.8747536651.

The spelling of 669634241 in words is "six hundred sixty-nine million, six hundred thirty-four thousand, two hundred forty-one".