255863279540 has 24 divisors (see below), whose sum is σ = 586159513632. Its totient is φ = 93041192480.

The previous prime is 255863279489. The next prime is 255863279627. The reversal of 255863279540 is 45972368552.

It is a happy number.

It is a super-2 number, since 2×255863279540² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 581507234 + ... + 581507673.

It is an arithmetic number, because the mean of its divisors is an integer number (24423313068).

Almost surely, 2^255863279540 is an apocalyptic number.

255863279540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255863279540 is an abundant number, since it is smaller than the sum of its proper divisors (330296234092).

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

255863279540 is a wasteful number, since it uses less digits than its factorization.

255863279540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163014927 (or 1163014925 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 56.

The spelling of 255863279540 in words is "two hundred fifty-five billion, eight hundred sixty-three million, two hundred seventy-nine thousand, five hundred forty".