18163691144 has 16 divisors (see below), whose sum is σ = 34265861520. Its totient is φ = 9026128080.

The previous prime is 18163691141. The next prime is 18163691149. The reversal of 18163691144 is 44119636181.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18163691095 and 18163691104.

It is not an unprimeable number, because it can be changed into a prime (18163691141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6963302 + ... + 6965909.

It is an arithmetic number, because the mean of its divisors is an integer number (2141616345).

Almost surely, 2^18163691144 is an apocalyptic number.

It is an amenable number.

18163691144 is a deficient number, since it is larger than the sum of its proper divisors (16102170376).

18163691144 is a wasteful number, since it uses less digits than its factorization.

18163691144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13929380 (or 13929376 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The spelling of 18163691144 in words is "eighteen billion, one hundred sixty-three million, six hundred ninety-one thousand, one hundred forty-four".