51683684251 has 4 divisors (see below), whose sum is σ = 53350899904. Its totient is φ = 50016468600.

The previous prime is 51683684249. The next prime is 51683684267. The reversal of 51683684251 is 15248638615.

51683684251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51683684251 - 2¹ = 51683684249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51683684195 and 51683684204.

It is not an unprimeable number, because it can be changed into a prime (51683684231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833607780 + ... + 833607841.

It is an arithmetic number, because the mean of its divisors is an integer number (13337724976).

Almost surely, 2^51683684251 is an apocalyptic number.

51683684251 is a deficient number, since it is larger than the sum of its proper divisors (1667215653).

51683684251 is a wasteful number, since it uses less digits than its factorization.

51683684251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667215652.

The product of its digits is 1382400, while the sum is 49.

The spelling of 51683684251 in words is "fifty-one billion, six hundred eighty-three million, six hundred eighty-four thousand, two hundred fifty-one".