255500807640 has 128 divisors (see below), whose sum is σ = 825690075840. Its totient is φ = 62875293696.

The previous prime is 255500807623. The next prime is 255500807669. The reversal of 255500807640 is 46708005552.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 255500807592 and 255500807601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6239874 + ... + 6280686.

Almost surely, 2^255500807640 is an apocalyptic number.

255500807640 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 255500807640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412845037920).

255500807640 is an abundant number, since it is smaller than the sum of its proper divisors (570189268200).

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

255500807640 is a wasteful number, since it uses less digits than its factorization.

255500807640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44853 (or 44849 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 42.

The spelling of 255500807640 in words is "two hundred fifty-five billion, five hundred million, eight hundred seven thousand, six hundred forty".