56668889 has 2 divisors, whose sum is σ = 56668890. Its totient is φ = 56668888.

The previous prime is 56668879. The next prime is 56668907. The reversal of 56668889 is 98886665.

56668889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 43264 = 7525^2 + 208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56668889 is a prime.

It is a super-2 number, since 2×56668889² = 6422725960988642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (56668879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28334444 + 28334445.

It is an arithmetic number, because the mean of its divisors is an integer number (28334445).

Almost surely, 2^56668889 is an apocalyptic number.

It is an amenable number.

56668889 is a deficient number, since it is larger than the sum of its proper divisors (1).

56668889 is an equidigital number, since it uses as much as digits as its factorization.

56668889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 56.

The square root of 56668889 is about 7527.8741355047. The cubic root of 56668889 is about 384.1034719172.

The spelling of 56668889 in words is "fifty-six million, six hundred sixty-eight thousand, eight hundred eighty-nine".