255578131566 has 48 divisors (see below), whose sum is σ = 559908039600. Its totient is φ = 84250497024.

The previous prime is 255578131561. The next prime is 255578131579. The reversal of 255578131566 is 665131875552.

255578131566 is a `hidden beast` number, since 2 + 5 + 5 + 5 + 78 + 1 + 3 + 1 + 566 = 666.

255578131566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×255578131566² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255578131561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444280 + ... + 841748.

It is an arithmetic number, because the mean of its divisors is an integer number (11664750825).

Almost surely, 2^255578131566 is an apocalyptic number.

255578131566 is an abundant number, since it is smaller than the sum of its proper divisors (304329908034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255578131566 is a wasteful number, since it uses less digits than its factorization.

255578131566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397873 (or 397870 counting only the distinct ones).

The product of its digits is 7560000, while the sum is 54.

The spelling of 255578131566 in words is "two hundred fifty-five billion, five hundred seventy-eight million, one hundred thirty-one thousand, five hundred sixty-six".