255217399556 has 24 divisors (see below), whose sum is σ = 518802586176. Its totient is φ = 107585788320.

The previous prime is 255217399511. The next prime is 255217399603. The reversal of 255217399556 is 655993712552.

It is a happy number.

It is a super-2 number, since 2×255217399556² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 255217399495 and 255217399504.

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, 74710646 + ... + 74714061.

It is an arithmetic number, because the mean of its divisors is an integer number (21616774424).

Almost surely, 2^255217399556 is an apocalyptic number.

It is an amenable number.

255217399556 is an abundant number, since it is smaller than the sum of its proper divisors (263585186620).

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

255217399556 is a wasteful number, since it uses less digits than its factorization.

255217399556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149424779 (or 149424777 counting only the distinct ones).

The product of its digits is 25515000, while the sum is 59.

The spelling of 255217399556 in words is "two hundred fifty-five billion, two hundred seventeen million, three hundred ninety-nine thousand, five hundred fifty-six".