255787681157 has 4 divisors (see below), whose sum is σ = 255797247660. Its totient is φ = 255778114656.

The previous prime is 255787681147. The next prime is 255787681169. The reversal of 255787681157 is 751186787552.

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 175975216036 + 79812465121 = 419494^2 + 282511^2 .

It is a cyclic number.

It is not a de Polignac number, because 255787681157 - 2¹⁶ = 255787615621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255787681157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255787681147) 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, 4743032 + ... + 4796657.

It is an arithmetic number, because the mean of its divisors is an integer number (63949311915).

Almost surely, 2^255787681157 is an apocalyptic number.

It is an amenable number.

255787681157 is a deficient number, since it is larger than the sum of its proper divisors (9566503).

255787681157 is an equidigital number, since it uses as much as digits as its factorization.

255787681157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9566502.

The product of its digits is 32928000, while the sum is 62.

The spelling of 255787681157 in words is "two hundred fifty-five billion, seven hundred eighty-seven million, six hundred eighty-one thousand, one hundred fifty-seven".