668822887 has 2 divisors, whose sum is σ = 668822888. Its totient is φ = 668822886.

The previous prime is 668822837. The next prime is 668822893. The reversal of 668822887 is 788228866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668822887 - 2²³ = 660434279 is a prime.

It is a super-3 number, since 3×668822887³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668822827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334411443 + 334411444.

It is an arithmetic number, because the mean of its divisors is an integer number (334411444).

Almost surely, 2^668822887 is an apocalyptic number.

668822887 is a deficient number, since it is larger than the sum of its proper divisors (1).

668822887 is an equidigital number, since it uses as much as digits as its factorization.

668822887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4128768, while the sum is 55.

The square root of 668822887 is about 25861.6102940246. The cubic root of 668822887 is about 874.5212671559.

The spelling of 668822887 in words is "six hundred sixty-eight million, eight hundred twenty-two thousand, eight hundred eighty-seven".