51688138161015 has 32 divisors (see below), whose sum is σ = 91891330200000. Its totient is φ = 27566614978560.

The previous prime is 51688138160999. The next prime is 51688138161019. The reversal of 51688138161015 is 51016183188615.

51688138161015 is a `hidden beast` number, since 5 + 1 + 6 + 8 + 8 + 1 + 3 + 8 + 1 + 610 + 15 = 666.

It is not a de Polignac number, because 51688138161015 - 2⁴ = 51688138160999 is a prime.

It is a super-3 number, since 3×51688138161015³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51688138161019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6931735 + ... + 12305495.

It is an arithmetic number, because the mean of its divisors is an integer number (2871604068750).

Almost surely, 2^{51688138161015} is an apocalyptic number.

51688138161015 is a deficient number, since it is larger than the sum of its proper divisors (40203192038985).

51688138161015 is a wasteful number, since it uses less digits than its factorization.

51688138161015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5445024 (or 5445018 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 54.

The spelling of 51688138161015 in words is "fifty-one trillion, six hundred eighty-eight billion, one hundred thirty-eight million, one hundred sixty-one thousand, fifteen".