51381876836 has 6 divisors (see below), whose sum is σ = 89918284470. Its totient is φ = 25690938416.

The previous prime is 51381876829. The next prime is 51381876841. The reversal of 51381876836 is 63867818315.

It can be written as a sum of positive squares in only one way, i.e., 35792856100 + 15589020736 = 189190^2 + 124856^2 .

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 as a sum of consecutive naturals, namely, 6422734601 + ... + 6422734608.

It is an arithmetic number, because the mean of its divisors is an integer number (14986380745).

Almost surely, 2^51381876836 is an apocalyptic number.

It is an amenable number.

51381876836 is a deficient number, since it is larger than the sum of its proper divisors (38536407634).

51381876836 is a wasteful number, since it uses less digits than its factorization.

51381876836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12845469213 (or 12845469211 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The spelling of 51381876836 in words is "fifty-one billion, three hundred eighty-one million, eight hundred seventy-six thousand, eight hundred thirty-six".