51387981844968 has 48 divisors (see below), whose sum is σ = 145226905218720. Its totient is φ = 16384573921056.

The previous prime is 51387981844949. The next prime is 51387981844981. The reversal of 51387981844968 is 86944818978315.

51387981844968 is a `hidden beast` number, since 5 + 1 + 3 + 87 + 98 + 1 + 8 + 449 + 6 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15515693346 + ... + 15515696657.

It is an arithmetic number, because the mean of its divisors is an integer number (3025560525390).

Almost surely, 2^{51387981844968} is an apocalyptic number.

It is an amenable number.

51387981844968 is an abundant number, since it is smaller than the sum of its proper divisors (93838923373752).

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

51387981844968 is a wasteful number, since it uses less digits than its factorization.

51387981844968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31031390038 (or 31031390031 counting only the distinct ones).

The product of its digits is 3344302080, while the sum is 81.

The spelling of 51387981844968 in words is "fifty-one trillion, three hundred eighty-seven billion, nine hundred eighty-one million, eight hundred forty-four thousand, nine hundred sixty-eight".