51758558712821 has 8 divisors (see below), whose sum is σ = 53545866562200. Its totient is φ = 49971419527680.

The previous prime is 51758558712793. The next prime is 51758558712871. The reversal of 51758558712821 is 12821785585715.

It can be written as a sum of positive squares in 4 ways, for example, as 26901493822225 + 24857064890596 = 5186665^2 + 4985686^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51758558712821 - 2²⁶ = 51758491603957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51758558712871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41541560 + ... + 42769361.

It is an arithmetic number, because the mean of its divisors is an integer number (6693233320275).

Almost surely, 2^{51758558712821} is an apocalyptic number.

It is an amenable number.

51758558712821 is a deficient number, since it is larger than the sum of its proper divisors (1787307849379).

51758558712821 is a wasteful number, since it uses less digits than its factorization.

51758558712821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84332119.

The product of its digits is 62720000, while the sum is 65.

The spelling of 51758558712821 in words is "fifty-one trillion, seven hundred fifty-eight billion, five hundred fifty-eight million, seven hundred twelve thousand, eight hundred twenty-one".