51235208556 has 192 divisors, whose sum is σ = 146769208320. Its totient is φ = 13586227200.

The previous prime is 51235208551. The next prime is 51235208627. The reversal of 51235208556 is 65580253215.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (51235208551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18290356 + ... + 18293156.

It is an arithmetic number, because the mean of its divisors is an integer number (764422960).

Almost surely, 2^51235208556 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 51235208556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73384604160).

51235208556 is an abundant number, since it is smaller than the sum of its proper divisors (95533999764).

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

51235208556 is a wasteful number, since it uses less digits than its factorization.

51235208556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064 (or 3062 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 42.

The spelling of 51235208556 in words is "fifty-one billion, two hundred thirty-five million, two hundred eight thousand, five hundred fifty-six".