51891986326 has 4 divisors (see below), whose sum is σ = 77837979492. Its totient is φ = 25945993162.

The previous prime is 51891986309. The next prime is 51891986359. The reversal of 51891986326 is 62368919815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62368919815 = 5 ⋅12473783963.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12972996580 + ... + 12972996583.

It is an arithmetic number, because the mean of its divisors is an integer number (19459494873).

Almost surely, 2^51891986326 is an apocalyptic number.

51891986326 is a deficient number, since it is larger than the sum of its proper divisors (25945993166).

51891986326 is a wasteful number, since it uses less digits than its factorization.

51891986326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25945993165.

The product of its digits is 5598720, while the sum is 58.

The spelling of 51891986326 in words is "fifty-one billion, eight hundred ninety-one million, nine hundred eighty-six thousand, three hundred twenty-six".