255999999990 has 128 divisors (see below), whose sum is σ = 740975662080. Its totient is φ = 55296000000.

The previous prime is 255999999989. The next prime is 256000000007. The reversal of 255999999990 is 99999999552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1519990 + ... + 1679990.

It is an arithmetic number, because the mean of its divisors is an integer number (5788872360).

Almost surely, 2^255999999990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255999999990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370487831040).

255999999990 is an abundant number, since it is smaller than the sum of its proper divisors (484975662090).

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

255999999990 is a wasteful number, since it uses less digits than its factorization.

255999999990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160438.

The product of its (nonzero) digits is 2152336050, while the sum is 84.

The spelling of 255999999990 in words is "two hundred fifty-five billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety".