18004044097 has 4 divisors (see below), whose sum is σ = 19388970580. Its totient is φ = 16619117616.

The previous prime is 18004044067. The next prime is 18004044109. The reversal of 18004044097 is 79044040081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79044040081 = 39979 ⋅1977139.

It can be written as a sum of positive squares in 2 ways, for example, as 1590334641 + 16413709456 = 39879^2 + 128116^2 .

It is a cyclic number.

It is not a de Polignac number, because 18004044097 - 2⁷ = 18004043969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18004044007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 692463222 + ... + 692463247.

It is an arithmetic number, because the mean of its divisors is an integer number (4847242645).

Almost surely, 2^18004044097 is an apocalyptic number.

It is an amenable number.

18004044097 is a deficient number, since it is larger than the sum of its proper divisors (1384926483).

18004044097 is a wasteful number, since it uses less digits than its factorization.

18004044097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384926482.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 18004044097 in words is "eighteen billion, four million, forty-four thousand, ninety-seven".