51687496687 has 8 divisors (see below), whose sum is σ = 51799271040. Its totient is φ = 51575771520.

The previous prime is 51687496669. The next prime is 51687496733. The reversal of 51687496687 is 78669478615.

51687496687 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51687496687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51607496687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2740963 + ... + 2759755.

It is an arithmetic number, because the mean of its divisors is an integer number (6474908880).

Almost surely, 2^51687496687 is an apocalyptic number.

51687496687 is a deficient number, since it is larger than the sum of its proper divisors (111774353).

51687496687 is a wasteful number, since it uses less digits than its factorization.

51687496687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24593.

The product of its digits is 121927680, while the sum is 67.

The spelling of 51687496687 in words is "fifty-one billion, six hundred eighty-seven million, four hundred ninety-six thousand, six hundred eighty-seven".