56511065550 has 96 divisors (see below), whose sum is σ = 146898597888. Its totient is φ = 14349582720.

The previous prime is 56511065543. The next prime is 56511065551. The reversal of 56511065550 is 5556011565.

56511065550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 56511065499 and 56511065508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56511065551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 732624 + ... + 806076.

It is an arithmetic number, because the mean of its divisors is an integer number (1530193728).

Almost surely, 2^56511065550 is an apocalyptic number.

56511065550 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 56511065550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73449298944).

56511065550 is an abundant number, since it is smaller than the sum of its proper divisors (90387532338).

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

56511065550 is a wasteful number, since it uses less digits than its factorization.

56511065550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73714 (or 73709 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 56511065550 in words is "fifty-six billion, five hundred eleven million, sixty-five thousand, five hundred fifty".