255569680520 has 384 divisors, whose sum is σ = 758924812800. Its totient is φ = 75673128960.

The previous prime is 255569680501. The next prime is 255569680529. The reversal of 255569680520 is 25086965552.

It is a Cunningham number, because it is equal to 505539²-1.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (255569680529) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 122339636 + ... + 122341724.

It is an arithmetic number, because the mean of its divisors is an integer number (1976366700).

Almost surely, 2^255569680520 is an apocalyptic number.

255569680520 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 255569680520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379462406400).

255569680520 is an abundant number, since it is smaller than the sum of its proper divisors (503355132280).

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

255569680520 is a wasteful number, since it uses less digits than its factorization.

255569680520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309 (or 2294 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 53.

The spelling of 255569680520 in words is "two hundred fifty-five billion, five hundred sixty-nine million, six hundred eighty thousand, five hundred twenty".