55861016856 has 128 divisors (see below), whose sum is σ = 149653785600. Its totient is φ = 17314519040.

The previous prime is 55861016851. The next prime is 55861016863. The reversal of 55861016856 is 65861016855.

It is a happy number.

It is a super-2 number, since 2×55861016856² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 55861016799 and 55861016808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55861016851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12771886 + ... + 12776258.

It is an arithmetic number, because the mean of its divisors is an integer number (1169170200).

Almost surely, 2^55861016856 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 55861016856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74826892800).

55861016856 is an abundant number, since it is smaller than the sum of its proper divisors (93792768744).

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

55861016856 is a wasteful number, since it uses less digits than its factorization.

55861016856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4769 (or 4765 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 51.

Subtracting 55861016856 from its reverse (65861016855), we obtain a palindrome (9999999999).

The spelling of 55861016856 in words is "fifty-five billion, eight hundred sixty-one million, sixteen thousand, eight hundred fifty-six".