51115666016560 has 40 divisors (see below), whose sum is σ = 118863308730096. Its totient is φ = 20442931311360.

The previous prime is 51115666016549. The next prime is 51115666016563. The reversal of 51115666016560 is 6561066651115.

51115666016560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×51115666016560² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51115666016563) 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 7 ways as a sum of consecutive naturals, for example, 51617319 + ... + 52598278.

Almost surely, 2^{51115666016560} is an apocalyptic number.

It is an amenable number.

51115666016560 is an abundant number, since it is smaller than the sum of its proper divisors (67747642713536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51115666016560 is a wasteful number, since it uses less digits than its factorization.

51115666016560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104221741 (or 104221735 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 51115666016560 in words is "fifty-one trillion, one hundred fifteen billion, six hundred sixty-six million, sixteen thousand, five hundred sixty".