51705175561 has 8 divisors (see below), whose sum is σ = 55742447880. Its totient is φ = 47676467712.

The previous prime is 51705175541. The next prime is 51705175567. The reversal of 51705175561 is 16557150715.

It can be written as a sum of positive squares in 4 ways, for example, as 9710919936 + 41994255625 = 98544^2 + 204925^2 .

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 51705175561 - 2¹³ = 51705167369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51705175567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2128570 + ... + 2152723.

It is an arithmetic number, because the mean of its divisors is an integer number (6967805985).

Almost surely, 2^51705175561 is an apocalyptic number.

It is an amenable number.

51705175561 is a deficient number, since it is larger than the sum of its proper divisors (4037272319).

51705175561 is a wasteful number, since it uses less digits than its factorization.

51705175561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4282235.

The product of its (nonzero) digits is 183750, while the sum is 43.

The spelling of 51705175561 in words is "fifty-one billion, seven hundred five million, one hundred seventy-five thousand, five hundred sixty-one".