668051256893 has 2 divisors, whose sum is σ = 668051256894. Its totient is φ = 668051256892.

The previous prime is 668051256871. The next prime is 668051256923. The reversal of 668051256893 is 398652150866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426354149764 + 241697107129 = 652958^2 + 491627^2 .

It is a cyclic number.

It is not a de Polignac number, because 668051256893 - 2²⁰ = 668050208317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668051256853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334025628446 + 334025628447.

It is an arithmetic number, because the mean of its divisors is an integer number (334025628447).

Almost surely, 2^668051256893 is an apocalyptic number.

It is an amenable number.

668051256893 is a deficient number, since it is larger than the sum of its proper divisors (1).

668051256893 is an equidigital number, since it uses as much as digits as its factorization.

668051256893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18662400, while the sum is 59.

The spelling of 668051256893 in words is "six hundred sixty-eight billion, fifty-one million, two hundred fifty-six thousand, eight hundred ninety-three".