18844028665 has 32 divisors (see below), whose sum is σ = 28361539584. Its totient is φ = 11676546240.

The previous prime is 18844028647. The next prime is 18844028669. The reversal of 18844028665 is 56682044881.

It is a happy number.

It is not a de Polignac number, because 18844028665 - 2¹³ = 18844020473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18844028669) 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 31 ways as a sum of consecutive naturals, for example, 82249 + ... + 210838.

It is an arithmetic number, because the mean of its divisors is an integer number (886298112).

Almost surely, 2^18844028665 is an apocalyptic number.

It is an amenable number.

18844028665 is a deficient number, since it is larger than the sum of its proper divisors (9517510919).

18844028665 is a wasteful number, since it uses less digits than its factorization.

18844028665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293277.

The product of its (nonzero) digits is 2949120, while the sum is 52.

The spelling of 18844028665 in words is "eighteen billion, eight hundred forty-four million, twenty-eight thousand, six hundred sixty-five".