51687496686 has 16 divisors (see below), whose sum is σ = 118142849664. Its totient is φ = 14767856184.

The previous prime is 51687496669. The next prime is 51687496733. The reversal of 51687496686 is 68669478615.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615327300 + ... + 615327383.

It is an arithmetic number, because the mean of its divisors is an integer number (7383928104).

Almost surely, 2^51687496686 is an apocalyptic number.

51687496686 is an abundant number, since it is smaller than the sum of its proper divisors (66455352978).

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

51687496686 is a wasteful number, since it uses less digits than its factorization.

51687496686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230654695.

The product of its digits is 104509440, while the sum is 66.

The spelling of 51687496686 in words is "fifty-one billion, six hundred eighty-seven million, four hundred ninety-six thousand, six hundred eighty-six".