18444394869 has 32 divisors (see below), whose sum is σ = 25182638208. Its totient is φ = 12004608000.

The previous prime is 18444394867. The next prime is 18444394879. The reversal of 18444394869 is 96849344481.

It is not a de Polignac number, because 18444394869 - 2¹ = 18444394867 is a prime.

It is a super-2 number, since 2×18444394869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18444394867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20935309 + ... + 20936189.

It is an arithmetic number, because the mean of its divisors is an integer number (786957444).

Almost surely, 2^18444394869 is an apocalyptic number.

It is an amenable number.

18444394869 is a deficient number, since it is larger than the sum of its proper divisors (6738243339).

18444394869 is a wasteful number, since it uses less digits than its factorization.

18444394869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669.

The product of its digits is 23887872, while the sum is 60.

The spelling of 18444394869 in words is "eighteen billion, four hundred forty-four million, three hundred ninety-four thousand, eight hundred sixty-nine".