18033144647 has 4 divisors (see below), whose sum is σ = 20609308176. Its totient is φ = 15456981120.

The previous prime is 18033144643. The next prime is 18033144653. The reversal of 18033144647 is 74644133081.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18033144647 - 2² = 18033144643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18033144643) 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, 1288081754 + ... + 1288081767.

It is an arithmetic number, because the mean of its divisors is an integer number (5152327044).

Almost surely, 2^18033144647 is an apocalyptic number.

18033144647 is a deficient number, since it is larger than the sum of its proper divisors (2576163529).

18033144647 is an equidigital number, since it uses as much as digits as its factorization.

18033144647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576163528.

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 18033144647 in words is "eighteen billion, thirty-three million, one hundred forty-four thousand, six hundred forty-seven".