51135505665205 has 32 divisors (see below), whose sum is σ = 66110938790400. Its totient is φ = 37745532582912.

The previous prime is 51135505665169. The next prime is 51135505665217. The reversal of 51135505665205 is 50256650553115.

51135505665205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51135505665205 - 2⁷ = 51135505665077 is a prime.

It is a super-2 number, since 2×51135505665205² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2109625476 + ... + 2109649714.

It is an arithmetic number, because the mean of its divisors is an integer number (2065966837200).

Almost surely, 2^{51135505665205} is an apocalyptic number.

It is an amenable number.

51135505665205 is a deficient number, since it is larger than the sum of its proper divisors (14975433125195).

51135505665205 is a wasteful number, since it uses less digits than its factorization.

51135505665205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36733.

The product of its (nonzero) digits is 3375000, while the sum is 49.

The spelling of 51135505665205 in words is "fifty-one trillion, one hundred thirty-five billion, five hundred five million, six hundred sixty-five thousand, two hundred five".