555666889 has 2 divisors, whose sum is σ = 555666890. Its totient is φ = 555666888.

The previous prime is 555666887. The next prime is 555666899. The reversal of 555666889 is 988666555.

It is a happy number.

555666889 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., 520204864 + 35462025 = 22808^2 + 5955^2 .

It is a cyclic number.

It is not a de Polignac number, because 555666889 - 2¹ = 555666887 is a prime.

Together with 555666887, it forms a pair of twin primes.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (555666887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277833444 + 277833445.

It is an arithmetic number, because the mean of its divisors is an integer number (277833445).

Almost surely, 2^555666889 is an apocalyptic number.

It is an amenable number.

555666889 is a deficient number, since it is larger than the sum of its proper divisors (1).

555666889 is an equidigital number, since it uses as much as digits as its factorization.

555666889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552000, while the sum is 58.

The square root of 555666889 is about 23572.5876602464. The cubic root of 555666889 is about 822.1256021526.

The spelling of 555666889 in words is "five hundred fifty-five million, six hundred sixty-six thousand, eight hundred eighty-nine".