255864563500 has 144 divisors (see below), whose sum is σ = 691544468160. Its totient is φ = 80976729600.

The previous prime is 255864563477. The next prime is 255864563519. The reversal of 255864563500 is 5365468552.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 375216 + ... + 807784.

It is an arithmetic number, because the mean of its divisors is an integer number (4802392140).

Almost surely, 2^255864563500 is an apocalyptic number.

255864563500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255864563500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345772234080).

255864563500 is an abundant number, since it is smaller than the sum of its proper divisors (435679904660).

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

255864563500 is a wasteful number, since it uses less digits than its factorization.

255864563500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432621 (or 432596 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 49.

The spelling of 255864563500 in words is "two hundred fifty-five billion, eight hundred sixty-four million, five hundred sixty-three thousand, five hundred".