18163972044 has 36 divisors (see below), whose sum is σ = 45946260360. Its totient is φ = 6050467200.

The previous prime is 18163972033. The next prime is 18163972049. The reversal of 18163972044 is 44027936181.

18163972044 is a `hidden beast` number, since 1 + 8 + 1 + 639 + 7 + 2 + 0 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (18163972049) 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 11 ways as a sum of consecutive naturals, for example, 121629 + ... + 226100.

It is an arithmetic number, because the mean of its divisors is an integer number (1276285010).

Almost surely, 2^18163972044 is an apocalyptic number.

It is an amenable number.

18163972044 is an abundant number, since it is smaller than the sum of its proper divisors (27782288316).

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

18163972044 is a wasteful number, since it uses less digits than its factorization.

18163972044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349190 (or 349185 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 18163972044 in words is "eighteen billion, one hundred sixty-three million, nine hundred seventy-two thousand, forty-four".