255689393720 has 16 divisors (see below), whose sum is σ = 575301135960. Its totient is φ = 102275757472.

The previous prime is 255689393719. The next prime is 255689393731. The reversal of 255689393720 is 27393986552.

It is a self number, because there is not a number n which added to its sum of digits gives 255689393720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3196117382 + ... + 3196117461.

Almost surely, 2^255689393720 is an apocalyptic number.

255689393720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255689393720 is an abundant number, since it is smaller than the sum of its proper divisors (319611742240).

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

255689393720 is a wasteful number, since it uses less digits than its factorization.

255689393720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6392234854 (or 6392234850 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 59.

The spelling of 255689393720 in words is "two hundred fifty-five billion, six hundred eighty-nine million, three hundred ninety-three thousand, seven hundred twenty".