56261880558 has 80 divisors (see below), whose sum is σ = 135845356416. Its totient is φ = 17301211200.

The previous prime is 56261880553. The next prime is 56261880569. The reversal of 56261880558 is 85508816265.

56261880558 is a `hidden beast` number, since 5 + 6 + 2 + 6 + 1 + 8 + 80 + 558 = 666.

It is a super-3 number, since 3×56261880558³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56261880551) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 4101960 + ... + 4115652.

Almost surely, 2^56261880558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56261880558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67922678208).

56261880558 is an abundant number, since it is smaller than the sum of its proper divisors (79583475858).

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

56261880558 is a wasteful number, since it uses less digits than its factorization.

56261880558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15671 (or 15662 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 54.

The spelling of 56261880558 in words is "fifty-six billion, two hundred sixty-one million, eight hundred eighty thousand, five hundred fifty-eight".