668898187753 has 2 divisors, whose sum is σ = 668898187754. Its totient is φ = 668898187752.

The previous prime is 668898187751. The next prime is 668898187777. The reversal of 668898187753 is 357781898866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 503804683264 + 165093504489 = 709792^2 + 406317^2 .

It is a cyclic number.

It is not a de Polignac number, because 668898187753 - 2¹ = 668898187751 is a prime.

Together with 668898187751, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 668898187753.

It is not a weakly prime, because it can be changed into another prime (668898187751) 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, 334449093876 + 334449093877.

It is an arithmetic number, because the mean of its divisors is an integer number (334449093877).

Almost surely, 2^668898187753 is an apocalyptic number.

It is an amenable number.

668898187753 is a deficient number, since it is larger than the sum of its proper divisors (1).

668898187753 is an equidigital number, since it uses as much as digits as its factorization.

668898187753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 975421440, while the sum is 76.

The spelling of 668898187753 in words is "six hundred sixty-eight billion, eight hundred ninety-eight million, one hundred eighty-seven thousand, seven hundred fifty-three".