668898187751 has 2 divisors, whose sum is σ = 668898187752. Its totient is φ = 668898187750.

The previous prime is 668898187739. The next prime is 668898187753. The reversal of 668898187751 is 157781898866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668898187751 - 2³⁴ = 651718318567 is a prime.

Together with 668898187753, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668898187753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334449093875 + 334449093876.

It is an arithmetic number, because the mean of its divisors is an integer number (334449093876).

Almost surely, 2^668898187751 is an apocalyptic number.

668898187751 is a deficient number, since it is larger than the sum of its proper divisors (1).

668898187751 is an equidigital number, since it uses as much as digits as its factorization.

668898187751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 325140480, while the sum is 74.

The spelling of 668898187751 in words is "six hundred sixty-eight billion, eight hundred ninety-eight million, one hundred eighty-seven thousand, seven hundred fifty-one".