555115511556 has 72 divisors (see below), whose sum is σ = 1429103370240. Its totient is φ = 181633098816.

The previous prime is 555115511513. The next prime is 555115511641. The reversal of 555115511556 is 655115511555.

It is a super-2 number, since 2×555115511556² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1244925 + ... + 1630971.

It is an arithmetic number, because the mean of its divisors is an integer number (19848657920).

Almost surely, 2^555115511556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 555115511556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714551685120).

555115511556 is an abundant number, since it is smaller than the sum of its proper divisors (873987858684).

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

555115511556 is a wasteful number, since it uses less digits than its factorization.

555115511556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386793 (or 386788 counting only the distinct ones).

The product of its digits is 468750, while the sum is 45.

Subtracting 555115511556 from its reverse (655115511555), we obtain a palindrome (99999999999).

The spelling of 555115511556 in words is "five hundred fifty-five billion, one hundred fifteen million, five hundred eleven thousand, five hundred fifty-six".