5217878156538 has 16 divisors (see below), whose sum is σ = 10561488317856. Its totient is φ = 1718337384720.

The previous prime is 5217878156509. The next prime is 5217878156573. The reversal of 5217878156538 is 8356518787125.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5238832993 + ... + 5238833988.

It is an arithmetic number, because the mean of its divisors is an integer number (660093019866).

Almost surely, 2^{5217878156538} is an apocalyptic number.

5217878156538 is an abundant number, since it is smaller than the sum of its proper divisors (5343610161318).

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

5217878156538 is a wasteful number, since it uses less digits than its factorization.

5217878156538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10477667069.

The product of its digits is 112896000, while the sum is 66.

The spelling of 5217878156538 in words is "five trillion, two hundred seventeen billion, eight hundred seventy-eight million, one hundred fifty-six thousand, five hundred thirty-eight".