668880941 has 2 divisors, whose sum is σ = 668880942. Its totient is φ = 668880940.

The previous prime is 668880937. The next prime is 668880943. The reversal of 668880941 is 149088866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581533225 + 87347716 = 24115^2 + 9346^2 .

It is a cyclic number.

It is not a de Polignac number, because 668880941 - 2² = 668880937 is a prime.

It is a Sophie Germain prime.

Together with 668880943, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 668880941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668880943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334440470 + 334440471.

It is an arithmetic number, because the mean of its divisors is an integer number (334440471).

Almost surely, 2^668880941 is an apocalyptic number.

It is an amenable number.

668880941 is a deficient number, since it is larger than the sum of its proper divisors (1).

668880941 is an equidigital number, since it uses as much as digits as its factorization.

668880941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 663552, while the sum is 50.

The square root of 668880941 is about 25862.7326669090. The cubic root of 668880941 is about 874.5465693148.

The spelling of 668880941 in words is "six hundred sixty-eight million, eight hundred eighty thousand, nine hundred forty-one".