255787863757 has 4 divisors (see below), whose sum is σ = 255937536540. Its totient is φ = 255638190976.

The previous prime is 255787863719. The next prime is 255787863797. The reversal of 255787863757 is 757368787552.

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 62063763876 + 193724099881 = 249126^2 + 440141^2 .

It is a cyclic number.

It is not a de Polignac number, because 255787863757 - 2⁷ = 255787863629 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 (255787863797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74833828 + ... + 74837245.

It is an arithmetic number, because the mean of its divisors is an integer number (63984384135).

Almost surely, 2^255787863757 is an apocalyptic number.

It is an amenable number.

255787863757 is a deficient number, since it is larger than the sum of its proper divisors (149672783).

255787863757 is a wasteful number, since it uses less digits than its factorization.

255787863757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149672782.

The product of its digits is 691488000, while the sum is 70.

The spelling of 255787863757 in words is "two hundred fifty-five billion, seven hundred eighty-seven million, eight hundred sixty-three thousand, seven hundred fifty-seven".