51200051240 has 128 divisors (see below), whose sum is σ = 131475324960. Its totient is φ = 17776902144.

The previous prime is 51200051239. The next prime is 51200051297. The reversal of 51200051240 is 4215000215.

It can be written as a sum of positive squares in 16 ways, for example, as 28502218276 + 22697832964 = 168826^2 + 150658^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14999774 + ... + 15003186.

Almost surely, 2^51200051240 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 51200051240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65737662480).

51200051240 is an abundant number, since it is smaller than the sum of its proper divisors (80275273720).

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

51200051240 is a wasteful number, since it uses less digits than its factorization.

51200051240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151 (or 5147 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 51200051240 its reverse (4215000215), we get a palindrome (55415051455).

The spelling of 51200051240 in words is "fifty-one billion, two hundred million, fifty-one thousand, two hundred forty".