255999999988 has 6 divisors (see below), whose sum is σ = 447999999986. Its totient is φ = 127999999992.

The previous prime is 255999999943. The next prime is 255999999989. The reversal of 255999999988 is 889999999552.

It can be written as a sum of positive squares in only one way, i.e., 161208674064 + 94791325924 = 401508^2 + 307882^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255999999989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31999999995 + ... + 32000000002.

Almost surely, 2^255999999988 is an apocalyptic number.

It is an amenable number.

255999999988 is a deficient number, since it is larger than the sum of its proper divisors (191999999998).

255999999988 is a wasteful number, since it uses less digits than its factorization.

255999999988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64000000001 (or 63999999999 counting only the distinct ones).

The product of its digits is 15305500800, while the sum is 91.

The spelling of 255999999988 in words is "two hundred fifty-five billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-eight".