51256425852 has 72 divisors (see below), whose sum is σ = 133939932672. Its totient is φ = 16510154400.

The previous prime is 51256425809. The next prime is 51256425877. The reversal of 51256425852 is 25852465215.

51256425852 is a `hidden beast` number, since 5 + 1 + 2 + 5 + 64 + 2 + 585 + 2 = 666.

It is a super-2 number, since 2×51256425852² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51256425798 and 51256425807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 737923 + ... + 804389.

Almost surely, 2^51256425852 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 51256425852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66969966336).

51256425852 is an abundant number, since it is smaller than the sum of its proper divisors (82683506820).

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

51256425852 is a wasteful number, since it uses less digits than its factorization.

51256425852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67199 (or 67194 counting only the distinct ones).

The product of its digits is 960000, while the sum is 45.

The spelling of 51256425852 in words is "fifty-one billion, two hundred fifty-six million, four hundred twenty-five thousand, eight hundred fifty-two".