51486379928787 has 4 divisors (see below), whose sum is σ = 68648506571720. Its totient is φ = 34324253285856.

The previous prime is 51486379928771. The next prime is 51486379928813. The reversal of 51486379928787 is 78782997368415.

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

It is not a de Polignac number, because 51486379928787 - 2⁴ = 51486379928771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51486379928707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8581063321462 + ... + 8581063321467.

It is an arithmetic number, because the mean of its divisors is an integer number (17162126642930).

Almost surely, 2^{51486379928787} is an apocalyptic number.

51486379928787 is a deficient number, since it is larger than the sum of its proper divisors (17162126642933).

51486379928787 is a wasteful number, since it uses less digits than its factorization.

51486379928787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17162126642932.

The product of its digits is 10241925120, while the sum is 84.

The spelling of 51486379928787 in words is "fifty-one trillion, four hundred eighty-six billion, three hundred seventy-nine million, nine hundred twenty-eight thousand, seven hundred eighty-seven".