51891946845696 has 160 divisors (see below), whose sum is σ = 158558727782400. Its totient is φ = 16739337553920.

The previous prime is 51891946845659. The next prime is 51891946845707. The reversal of 51891946845696 is 69654864919815.

It is a happy number.

51891946845696 is a `hidden beast` number, since 5 + 1 + 8 + 9 + 1 + 9 + 46 + 8 + 4 + 569 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60115936 + ... + 60973023.

It is an arithmetic number, because the mean of its divisors is an integer number (990992048640).

Almost surely, 2^{51891946845696} is an apocalyptic number.

It is an amenable number.

51891946845696 is an abundant number, since it is smaller than the sum of its proper divisors (106666780936704).

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

51891946845696 is a wasteful number, since it uses less digits than its factorization.

51891946845696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121089017 (or 121088995 counting only the distinct ones).

The product of its digits is 4031078400, while the sum is 81.

The spelling of 51891946845696 in words is "fifty-one trillion, eight hundred ninety-one billion, nine hundred forty-six million, eight hundred forty-five thousand, six hundred ninety-six".