668888235199 has 2 divisors, whose sum is σ = 668888235200. Its totient is φ = 668888235198.

The previous prime is 668888235151. The next prime is 668888235227. The reversal of 668888235199 is 991532888866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668888235199 - 2⁹ = 668888234687 is a prime.

It is a super-2 number, since 2×668888235199² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668888235109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334444117599 + 334444117600.

It is an arithmetic number, because the mean of its divisors is an integer number (334444117600).

Almost surely, 2^668888235199 is an apocalyptic number.

668888235199 is a deficient number, since it is larger than the sum of its proper divisors (1).

668888235199 is an equidigital number, since it uses as much as digits as its factorization.

668888235199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 358318080, while the sum is 73.

The spelling of 668888235199 in words is "six hundred sixty-eight billion, eight hundred eighty-eight million, two hundred thirty-five thousand, one hundred ninety-nine".