51705555505 has 8 divisors (see below), whose sum is σ = 65696470632. Its totient is φ = 38931241728.

The previous prime is 51705555491. The next prime is 51705555563. The reversal of 51705555505 is 50555550715.

It can be written as a sum of positive squares in 4 ways, for example, as 790340769 + 50915214736 = 28113^2 + 225644^2 .

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 51705555505 - 2⁹ = 51705554993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304150242 + ... + 304150411.

It is an arithmetic number, because the mean of its divisors is an integer number (8212058829).

Almost surely, 2^51705555505 is an apocalyptic number.

It is an amenable number.

51705555505 is a deficient number, since it is larger than the sum of its proper divisors (13990915127).

51705555505 is a wasteful number, since it uses less digits than its factorization.

51705555505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608300675.

The product of its (nonzero) digits is 546875, while the sum is 43.

The spelling of 51705555505 in words is "fifty-one billion, seven hundred five million, five hundred fifty-five thousand, five hundred five".