668981154263 has 2 divisors, whose sum is σ = 668981154264. Its totient is φ = 668981154262.

The previous prime is 668981154211. The next prime is 668981154293. The reversal of 668981154263 is 362451189866.

668981154263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668981154263 - 2⁶ = 668981154199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668981154293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334490577131 + 334490577132.

It is an arithmetic number, because the mean of its divisors is an integer number (334490577132).

Almost surely, 2^668981154263 is an apocalyptic number.

668981154263 is a deficient number, since it is larger than the sum of its proper divisors (1).

668981154263 is an equidigital number, since it uses as much as digits as its factorization.

668981154263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14929920, while the sum is 59.

The spelling of 668981154263 in words is "six hundred sixty-eight billion, nine hundred eighty-one million, one hundred fifty-four thousand, two hundred sixty-three".