668248922449 has 2 divisors, whose sum is σ = 668248922450. Its totient is φ = 668248922448.

The previous prime is 668248922441. The next prime is 668248922489. The reversal of 668248922449 is 944229842866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657558810000 + 10690112449 = 810900^2 + 103393^2 .

It is a cyclic number.

It is not a de Polignac number, because 668248922449 - 2³ = 668248922441 is a prime.

It is not a weakly prime, because it can be changed into another prime (668248922441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334124461224 + 334124461225.

It is an arithmetic number, because the mean of its divisors is an integer number (334124461225).

Almost surely, 2^668248922449 is an apocalyptic number.

It is an amenable number.

668248922449 is a deficient number, since it is larger than the sum of its proper divisors (1).

668248922449 is an equidigital number, since it uses as much as digits as its factorization.

668248922449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95551488, while the sum is 64.

The spelling of 668248922449 in words is "six hundred sixty-eight billion, two hundred forty-eight million, nine hundred twenty-two thousand, four hundred forty-nine".