255761557 has 4 divisors (see below), whose sum is σ = 255798540. Its totient is φ = 255724576.

The previous prime is 255761543. The next prime is 255761647. The reversal of 255761557 is 755167552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96648561 + 159112996 = 9831^2 + 12614^2 .

It is a cyclic number.

It is not a de Polignac number, because 255761557 - 2²³ = 247372949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255761657) 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 in 3 ways as a sum of consecutive naturals, for example, 4678 + ... + 23095.

It is an arithmetic number, because the mean of its divisors is an integer number (63949635).

Almost surely, 2^255761557 is an apocalyptic number.

It is an amenable number.

255761557 is a deficient number, since it is larger than the sum of its proper divisors (36983).

255761557 is an equidigital number, since it uses as much as digits as its factorization.

255761557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36982.

The product of its digits is 367500, while the sum is 43.

The square root of 255761557 is about 15992.5469203626. The cubic root of 255761557 is about 634.7632217012.

The spelling of 255761557 in words is "two hundred fifty-five million, seven hundred sixty-one thousand, five hundred fifty-seven".