51731321055065 has 8 divisors (see below), whose sum is σ = 62077624432008. Its totient is φ = 41385030733440.

The previous prime is 51731321055053. The next prime is 51731321055077. The reversal of 51731321055065 is 56055012313715.

51731321055065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51731321055053) and next prime (51731321055077).

It can be written as a sum of positive squares in 4 ways, for example, as 6354674639104 + 45376646415961 = 2520848^2 + 6736219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51731321055065 - 2²⁰ = 51731320006489 is a prime.

It is a super-2 number, since 2×51731321055065² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11643269 + ... + 15460541.

It is an arithmetic number, because the mean of its divisors is an integer number (7759703054001).

Almost surely, 2^{51731321055065} is an apocalyptic number.

It is an amenable number.

51731321055065 is a deficient number, since it is larger than the sum of its proper divisors (10346303376943).

51731321055065 is a wasteful number, since it uses less digits than its factorization.

51731321055065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6527659.

The product of its (nonzero) digits is 472500, while the sum is 44.

The spelling of 51731321055065 in words is "fifty-one trillion, seven hundred thirty-one billion, three hundred twenty-one million, fifty-five thousand, sixty-five".