255961669 has 2 divisors, whose sum is σ = 255961670. Its totient is φ = 255961668.

The previous prime is 255961663. The next prime is 255961681. The reversal of 255961669 is 966169552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149768644 + 106193025 = 12238^2 + 10305^2 .

It is a cyclic number.

It is not a de Polignac number, because 255961669 - 2²³ = 247573061 is a prime.

It is a super-2 number, since 2×255961669² = 131032751994531122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255961663) 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, 127980834 + 127980835.

It is an arithmetic number, because the mean of its divisors is an integer number (127980835).

Almost surely, 2^255961669 is an apocalyptic number.

It is an amenable number.

255961669 is a deficient number, since it is larger than the sum of its proper divisors (1).

255961669 is an equidigital number, since it uses as much as digits as its factorization.

255961669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 49.

The square root of 255961669 is about 15998.8021114082. The cubic root of 255961669 is about 634.9287282316.

The spelling of 255961669 in words is "two hundred fifty-five million, nine hundred sixty-one thousand, six hundred sixty-nine".