51702715821 has 16 divisors (see below), whose sum is σ = 69777279936. Its totient is φ = 34048430976.

The previous prime is 51702715819. The next prime is 51702715829. The reversal of 51702715821 is 12851720715.

51702715821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51702715821 - 2¹ = 51702715819 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51702715821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51702715829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3157371 + ... + 3173703.

It is an arithmetic number, because the mean of its divisors is an integer number (4361079996).

Almost surely, 2^51702715821 is an apocalyptic number.

It is an amenable number.

51702715821 is a deficient number, since it is larger than the sum of its proper divisors (18074564115).

51702715821 is a wasteful number, since it uses less digits than its factorization.

51702715821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29132.

The product of its (nonzero) digits is 39200, while the sum is 39.

The spelling of 51702715821 in words is "fifty-one billion, seven hundred two million, seven hundred fifteen thousand, eight hundred twenty-one".