56551115550 has 96 divisors (see below), whose sum is σ = 141665620320. Its totient is φ = 14928076800.

The previous prime is 56551115521. The next prime is 56551115561. The reversal of 56551115550 is 5551115565.

It is a junction number, because it is equal to n+sod(n) for n = 56551115499 and 56551115508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18117990 + ... + 18121110.

It is an arithmetic number, because the mean of its divisors is an integer number (1475683545).

Almost surely, 2^56551115550 is an apocalyptic number.

56551115550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 56551115550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70832810160).

56551115550 is an abundant number, since it is smaller than the sum of its proper divisors (85114504770).

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

56551115550 is a wasteful number, since it uses less digits than its factorization.

56551115550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318 (or 4313 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 39.

The spelling of 56551115550 in words is "fifty-six billion, five hundred fifty-one million, one hundred fifteen thousand, five hundred fifty".