51887316538 has 8 divisors (see below), whose sum is σ = 77833957140. Its totient is φ = 25942664160.

The previous prime is 51887316473. The next prime is 51887316541. The reversal of 51887316538 is 83561378815.

51887316538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 39224990809 + 12662325729 = 198053^2 + 112527^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430003 + ... + 537286.

Almost surely, 2^51887316538 is an apocalyptic number.

51887316538 is a deficient number, since it is larger than the sum of its proper divisors (25946640602).

51887316538 is a wasteful number, since it uses less digits than its factorization.

51887316538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994112.

The product of its digits is 4838400, while the sum is 55.

The spelling of 51887316538 in words is "fifty-one billion, eight hundred eighty-seven million, three hundred sixteen thousand, five hundred thirty-eight".