51173985391689 has 8 divisors (see below), whose sum is σ = 68232014877952. Its totient is φ = 34115973083280.

The previous prime is 51173985391687. The next prime is 51173985391717. The reversal of 51173985391689 is 98619358937115.

51173985391689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51173985391689 - 2¹ = 51173985391687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51173985391689.

It is not an unprimeable number, because it can be changed into a prime (51173985391687) 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, 6618024 + ... + 12089094.

It is an arithmetic number, because the mean of its divisors is an integer number (8529001859744).

Almost surely, 2^{51173985391689} is an apocalyptic number.

It is an amenable number.

51173985391689 is a deficient number, since it is larger than the sum of its proper divisors (17058029486263).

51173985391689 is a wasteful number, since it uses less digits than its factorization.

51173985391689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8588927.

The product of its digits is 440899200, while the sum is 75.

The spelling of 51173985391689 in words is "fifty-one trillion, one hundred seventy-three billion, nine hundred eighty-five million, three hundred ninety-one thousand, six hundred eighty-nine".