255978756513 has 12 divisors (see below), whose sum is σ = 370293256788. Its totient is φ = 170400428640.

The previous prime is 255978756493. The next prime is 255978756569. The reversal of 255978756513 is 315657879552.

255978756513 is a `hidden beast` number, since 2 + 5 + 59 + 7 + 8 + 7 + 565 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 164830316049 + 91148440464 = 405993^2 + 301908^2 .

It is not a de Polignac number, because 255978756513 - 2²¹ = 255976659361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255978756713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20999878 + ... + 21012063.

It is an arithmetic number, because the mean of its divisors is an integer number (30857771399).

Almost surely, 2^255978756513 is an apocalyptic number.

It is an amenable number.

255978756513 is a deficient number, since it is larger than the sum of its proper divisors (114314500275).

255978756513 is a wasteful number, since it uses less digits than its factorization.

255978756513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42012624 (or 42012621 counting only the distinct ones).

The product of its digits is 79380000, while the sum is 63.

The spelling of 255978756513 in words is "two hundred fifty-five billion, nine hundred seventy-eight million, seven hundred fifty-six thousand, five hundred thirteen".