668107457 has 2 divisors, whose sum is σ = 668107458. Its totient is φ = 668107456.

The previous prime is 668107403. The next prime is 668107459. The reversal of 668107457 is 754701866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 476810896 + 191296561 = 21836^2 + 13831^2 .

It is a cyclic number.

It is not a de Polignac number, because 668107457 - 2²⁸ = 399672001 is a prime.

Together with 668107459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668107459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334053728 + 334053729.

It is an arithmetic number, because the mean of its divisors is an integer number (334053729).

Almost surely, 2^668107457 is an apocalyptic number.

It is an amenable number.

668107457 is a deficient number, since it is larger than the sum of its proper divisors (1).

668107457 is an equidigital number, since it uses as much as digits as its factorization.

668107457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 668107457 is about 25847.7747011227. The cubic root of 668107457 is about 874.2093350630.

The spelling of 668107457 in words is "six hundred sixty-eight million, one hundred seven thousand, four hundred fifty-seven".