668880887 has 2 divisors, whose sum is σ = 668880888. Its totient is φ = 668880886.

The previous prime is 668880841. The next prime is 668880889. The reversal of 668880887 is 788088866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668880887 - 2²⁸ = 400445431 is a prime.

Together with 668880889, 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 (668880889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334440443 + 334440444.

It is an arithmetic number, because the mean of its divisors is an integer number (334440444).

Almost surely, 2^668880887 is an apocalyptic number.

668880887 is a deficient number, since it is larger than the sum of its proper divisors (1).

668880887 is an equidigital number, since it uses as much as digits as its factorization.

668880887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8257536, while the sum is 59.

The square root of 668880887 is about 25862.7316229357. The cubic root of 668880887 is about 874.5465457802.

The spelling of 668880887 in words is "six hundred sixty-eight million, eight hundred eighty thousand, eight hundred eighty-seven".