17878887871 has 16 divisors (see below), whose sum is σ = 19625802336. Its totient is φ = 16185326976.

The previous prime is 17878887869. The next prime is 17878887959.

17878887871 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 17878887871 - 2¹ = 17878887869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17878887871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17878887841) 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 15 ways as a sum of consecutive naturals, for example, 2347756 + ... + 2355358.

It is an arithmetic number, because the mean of its divisors is an integer number (1226612646).

Almost surely, 2^17878887871 is an apocalyptic number.

17878887871 is a deficient number, since it is larger than the sum of its proper divisors (1746914465).

17878887871 is a wasteful number, since it uses less digits than its factorization.

17878887871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11082.

The product of its digits is 78675968, while the sum is 70.

The spelling of 17878887871 in words is "seventeen billion, eight hundred seventy-eight million, eight hundred eighty-seven thousand, eight hundred seventy-one".