18378883617 has 48 divisors (see below), whose sum is σ = 26890842240. Its totient is φ = 11157239808.

The previous prime is 18378883609. The next prime is 18378883637. The reversal of 18378883617 is 71638887381.

It is not a de Polignac number, because 18378883617 - 2³ = 18378883609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18378883637) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3351684 + ... + 3357162.

It is an arithmetic number, because the mean of its divisors is an integer number (560225880).

Almost surely, 2^18378883617 is an apocalyptic number.

18378883617 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18378883617 is a deficient number, since it is larger than the sum of its proper divisors (8511958623).

18378883617 is a wasteful number, since it uses less digits than its factorization.

18378883617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5642 (or 5625 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 60.

The spelling of 18378883617 in words is "eighteen billion, three hundred seventy-eight million, eight hundred eighty-three thousand, six hundred seventeen".