51056523540 has 108 divisors (see below), whose sum is σ = 170230679892. Its totient is φ = 12377333760.

The previous prime is 51056523503. The next prime is 51056523587. The reversal of 51056523540 is 4532565015.

51056523540 is a `hidden beast` number, since 5 + 10 + 56 + 52 + 3 + 540 = 666.

51056523540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 38139746436 + 12916777104 = 195294^2 + 113652^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51056523495 and 51056523504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1150317 + ... + 1193876.

It is an arithmetic number, because the mean of its divisors is an integer number (1576209999).

Almost surely, 2^51056523540 is an apocalyptic number.

It is an amenable number.

51056523540 is an abundant number, since it is smaller than the sum of its proper divisors (119174156352).

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

51056523540 is a wasteful number, since it uses less digits than its factorization.

51056523540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344230 (or 2344214 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The spelling of 51056523540 in words is "fifty-one billion, fifty-six million, five hundred twenty-three thousand, five hundred forty".