255801128849 has 24 divisors (see below), whose sum is σ = 310040236800. Its totient is φ = 210174320160.

The previous prime is 255801128839. The next prime is 255801128857. The reversal of 255801128849 is 948821108552.

It is not a de Polignac number, because 255801128849 - 2²⁰ = 255800080273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255801128849.

It is not an unprimeable number, because it can be changed into a prime (255801128819) 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, 450017 + ... + 845054.

It is an arithmetic number, because the mean of its divisors is an integer number (12918343200).

Almost surely, 2^255801128849 is an apocalyptic number.

255801128849 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

255801128849 is a deficient number, since it is larger than the sum of its proper divisors (54239107951).

255801128849 is a wasteful number, since it uses less digits than its factorization.

255801128849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295253 (or 1295246 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 53.

The spelling of 255801128849 in words is "two hundred fifty-five billion, eight hundred one million, one hundred twenty-eight thousand, eight hundred forty-nine".