51086750644481 has 4 divisors (see below), whose sum is σ = 52848362735700. Its totient is φ = 49325138553264.

The previous prime is 51086750644459. The next prime is 51086750644591. The reversal of 51086750644481 is 18444605768015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26730709530625 + 24356041113856 = 5170175^2 + 4935184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51086750644481 is a prime.

It is a super-2 number, since 2×51086750644481² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51086750644481.

It is not an unprimeable number, because it can be changed into a prime (51086750644681) 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, 880806045566 + ... + 880806045623.

It is an arithmetic number, because the mean of its divisors is an integer number (13212090683925).

Almost surely, 2^{51086750644481} is an apocalyptic number.

It is an amenable number.

51086750644481 is a deficient number, since it is larger than the sum of its proper divisors (1761612091219).

51086750644481 is a wasteful number, since it uses less digits than its factorization.

51086750644481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761612091218.

The product of its (nonzero) digits is 25804800, while the sum is 59.

The spelling of 51086750644481 in words is "fifty-one trillion, eighty-six billion, seven hundred fifty million, six hundred forty-four thousand, four hundred eighty-one".