51636513612205 has 8 divisors (see below), whose sum is σ = 61997112324504. Its totient is φ = 41287013563200.

The previous prime is 51636513612059. The next prime is 51636513612287. The reversal of 51636513612205 is 50221631563615.

It can be written as a sum of positive squares in 4 ways, for example, as 179147334564 + 51457366277641 = 423258^2 + 7173379^2 .

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

It is not a de Polignac number, because 51636513612205 - 2²¹ = 51636511515053 is a prime.

It is a Duffinian number.

It is a congruent 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, 2774655586 + ... + 2774674195.

It is an arithmetic number, because the mean of its divisors is an integer number (7749639040563).

Almost surely, 2^{51636513612205} is an apocalyptic number.

It is an amenable number.

51636513612205 is a deficient number, since it is larger than the sum of its proper divisors (10360598712299).

51636513612205 is a wasteful number, since it uses less digits than its factorization.

51636513612205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5549331647.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 51636513612205 in words is "fifty-one trillion, six hundred thirty-six billion, five hundred thirteen million, six hundred twelve thousand, two hundred five".