51715849218817 has 16 divisors (see below), whose sum is σ = 61099730030592. Its totient is φ = 42835131210960.

The previous prime is 51715849218779. The next prime is 51715849218823. The reversal of 51715849218817 is 71881294851715.

It is not a de Polignac number, because 51715849218817 - 2³⁹ = 51166093404929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51715849218827) 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, 174318763 + ... + 174615184.

It is an arithmetic number, because the mean of its divisors is an integer number (3818733126912).

Almost surely, 2^{51715849218817} is an apocalyptic number.

It is an amenable number.

51715849218817 is a deficient number, since it is larger than the sum of its proper divisors (9383880811775).

51715849218817 is a wasteful number, since it uses less digits than its factorization.

51715849218817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348934668.

The product of its digits is 45158400, while the sum is 67.

The spelling of 51715849218817 in words is "fifty-one trillion, seven hundred fifteen billion, eight hundred forty-nine million, two hundred eighteen thousand, eight hundred seventeen".