51865361867285 has 64 divisors (see below), whose sum is σ = 64250563972608. Its totient is φ = 40174544277504.

The previous prime is 51865361867279. The next prime is 51865361867287. The reversal of 51865361867285 is 58276816356815.

51865361867285 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 a de Polignac number, because none of the positive numbers 2^k-51865361867285 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51865361867287) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 11887543514 + ... + 11887547876.

It is an arithmetic number, because the mean of its divisors is an integer number (1003915062072).

Almost surely, 2^{51865361867285} is an apocalyptic number.

51865361867285 is the 4157939-th octagonal number.

It is an amenable number.

51865361867285 is a deficient number, since it is larger than the sum of its proper divisors (12385202105323).

51865361867285 is a wasteful number, since it uses less digits than its factorization.

51865361867285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5934.

The product of its digits is 580608000, while the sum is 71.

The spelling of 51865361867285 in words is "fifty-one trillion, eight hundred sixty-five billion, three hundred sixty-one million, eight hundred sixty-seven thousand, two hundred eighty-five".