19865598116 has 24 divisors (see below), whose sum is σ = 42787442880. Its totient is φ = 7858917792.

The previous prime is 19865598061. The next prime is 19865598119. The reversal of 19865598116 is 61189556891.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19865598119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27287546 + ... + 27288273.

It is an arithmetic number, because the mean of its divisors is an integer number (1782810120).

Almost surely, 2^19865598116 is an apocalyptic number.

It is an amenable number.

19865598116 is an abundant number, since it is smaller than the sum of its proper divisors (22921844764).

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

19865598116 is a wasteful number, since it uses less digits than its factorization.

19865598116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54575843 (or 54575841 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 59.

The spelling of 19865598116 in words is "nineteen billion, eight hundred sixty-five million, five hundred ninety-eight thousand, one hundred sixteen".