18244490018 has 4 divisors (see below), whose sum is σ = 27366735030. Its totient is φ = 9122245008.

The previous prime is 18244490003. The next prime is 18244490021. The reversal of 18244490018 is 81009444281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81009444281 = 113 ⋅716897737.

It can be written as a sum of positive squares in only one way, i.e., 17884515289 + 359974729 = 133733^2 + 18973^2 .

It is a super-2 number, since 2×18244490018² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4561122503 + ... + 4561122506.

Almost surely, 2^18244490018 is an apocalyptic number.

18244490018 is a deficient number, since it is larger than the sum of its proper divisors (9122245012).

18244490018 is an equidigital number, since it uses as much as digits as its factorization.

18244490018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9122245011.

The product of its (nonzero) digits is 73728, while the sum is 41.

The spelling of 18244490018 in words is "eighteen billion, two hundred forty-four million, four hundred ninety thousand, eighteen".