51338678187 has 4 divisors (see below), whose sum is σ = 68451570920. Its totient is φ = 34225785456.

The previous prime is 51338678179. The next prime is 51338678213. The reversal of 51338678187 is 78187683315.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51338678187 - 2³ = 51338678179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51338678137) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8556446362 + ... + 8556446367.

It is an arithmetic number, because the mean of its divisors is an integer number (17112892730).

Almost surely, 2^51338678187 is an apocalyptic number.

51338678187 is a deficient number, since it is larger than the sum of its proper divisors (17112892733).

51338678187 is a wasteful number, since it uses less digits than its factorization.

51338678187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17112892732.

The product of its digits is 6773760, while the sum is 57.

The spelling of 51338678187 in words is "fifty-one billion, three hundred thirty-eight million, six hundred seventy-eight thousand, one hundred eighty-seven".