255564889 has 2 divisors, whose sum is σ = 255564890. Its totient is φ = 255564888.

The previous prime is 255564847. The next prime is 255564971. The reversal of 255564889 is 988465552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237006025 + 18558864 = 15395^2 + 4308^2 .

It is a cyclic number.

It is not a de Polignac number, because 255564889 - 2¹⁷ = 255433817 is a prime.

It is a super-3 number, since 3×255564889³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (255564989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127782444 + 127782445.

It is an arithmetic number, because the mean of its divisors is an integer number (127782445).

Almost surely, 2^255564889 is an apocalyptic number.

It is an amenable number.

255564889 is a deficient number, since it is larger than the sum of its proper divisors (1).

255564889 is an equidigital number, since it uses as much as digits as its factorization.

255564889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456000, while the sum is 52.

The square root of 255564889 is about 15986.3969986986. The cubic root of 255564889 is about 634.6004794627.

The spelling of 255564889 in words is "two hundred fifty-five million, five hundred sixty-four thousand, eight hundred eighty-nine".