18809865603 has 20 divisors (see below), whose sum is σ = 28113885360. Its totient is φ = 12533128272.

The previous prime is 18809865601. The next prime is 18809865617. The reversal of 18809865603 is 30656890881.

It is not a de Polignac number, because 18809865603 - 2¹ = 18809865601 is a prime.

It is a super-2 number, since 2×18809865603² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18809865603.

It is not an unprimeable number, because it can be changed into a prime (18809865601) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 90178 + ... + 213896.

It is an arithmetic number, because the mean of its divisors is an integer number (1405694268).

Almost surely, 2^18809865603 is an apocalyptic number.

18809865603 is a deficient number, since it is larger than the sum of its proper divisors (9304019757).

18809865603 is a wasteful number, since it uses less digits than its factorization.

18809865603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125608 (or 125599 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 18809865603 in words is "eighteen billion, eight hundred nine million, eight hundred sixty-five thousand, six hundred three".