55129577856 has 128 divisors (see below), whose sum is σ = 147777273600. Its totient is φ = 18209138688.

The previous prime is 55129577837. The next prime is 55129577857. The reversal of 55129577856 is 65877592155.

55129577856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 55129577856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55129577857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26465391 + ... + 26467473.

It is an arithmetic number, because the mean of its divisors is an integer number (1154509950).

Almost surely, 2^55129577856 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 55129577856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73888636800).

55129577856 is an abundant number, since it is smaller than the sum of its proper divisors (92647695744).

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

55129577856 is a wasteful number, since it uses less digits than its factorization.

55129577856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696 (or 2684 counting only the distinct ones).

The product of its digits is 26460000, while the sum is 60.

The spelling of 55129577856 in words is "fifty-five billion, one hundred twenty-nine million, five hundred seventy-seven thousand, eight hundred fifty-six".