668248697 has 2 divisors, whose sum is σ = 668248698. Its totient is φ = 668248696.

The previous prime is 668248673. The next prime is 668248747. The reversal of 668248697 is 796842866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421727296 + 246521401 = 20536^2 + 15701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668248697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668241697) 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, 334124348 + 334124349.

It is an arithmetic number, because the mean of its divisors is an integer number (334124349).

Almost surely, 2^668248697 is an apocalyptic number.

It is an amenable number.

668248697 is a deficient number, since it is larger than the sum of its proper divisors (1).

668248697 is an equidigital number, since it uses as much as digits as its factorization.

668248697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 56.

The square root of 668248697 is about 25850.5067068327. The cubic root of 668248697 is about 874.2709342490.

The spelling of 668248697 in words is "six hundred sixty-eight million, two hundred forty-eight thousand, six hundred ninety-seven".