255562642557 has 24 divisors (see below), whose sum is σ = 392194575864. Its totient is φ = 159805722624.

The previous prime is 255562642553. The next prime is 255562642571. The reversal of 255562642557 is 755246265552.

255562642557 is a `hidden beast` number, since 2 + 5 + 5 + 5 + 626 + 4 + 2 + 5 + 5 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 54725116356 + 200837526201 = 233934^2 + 448149^2 .

It is not a de Polignac number, because 255562642557 - 2² = 255562642553 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255562642553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2805588 + ... + 2895245.

It is an arithmetic number, because the mean of its divisors is an integer number (16341440661).

Almost surely, 2^255562642557 is an apocalyptic number.

It is an amenable number.

255562642557 is a deficient number, since it is larger than the sum of its proper divisors (136631933307).

255562642557 is a wasteful number, since it uses less digits than its factorization.

255562642557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5701149 (or 5701146 counting only the distinct ones).

The product of its digits is 25200000, while the sum is 54.

The spelling of 255562642557 in words is "two hundred fifty-five billion, five hundred sixty-two million, six hundred forty-two thousand, five hundred fifty-seven".