668058889 has 2 divisors, whose sum is σ = 668058890. Its totient is φ = 668058888.

The previous prime is 668058883. The next prime is 668058899. The reversal of 668058889 is 988850866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 667964025 + 94864 = 25845^2 + 308^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668058889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668058883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334029444 + 334029445.

It is an arithmetic number, because the mean of its divisors is an integer number (334029445).

Almost surely, 2^668058889 is an apocalyptic number.

It is an amenable number.

668058889 is a deficient number, since it is larger than the sum of its proper divisors (1).

668058889 is an equidigital number, since it uses as much as digits as its factorization.

668058889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6635520, while the sum is 58.

The square root of 668058889 is about 25846.8351834417. The cubic root of 668058889 is about 874.1881510317.

The spelling of 668058889 in words is "six hundred sixty-eight million, fifty-eight thousand, eight hundred eighty-nine".