18023451784 has 64 divisors (see below), whose sum is σ = 37204453440. Its totient is φ = 8134214400.

The previous prime is 18023451767. The next prime is 18023451857. The reversal of 18023451784 is 48715432081.

It is a self number, because there is not a number n which added to its sum of digits gives 18023451784.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1686859 + ... + 1697509.

It is an arithmetic number, because the mean of its divisors is an integer number (581319585).

Almost surely, 2^18023451784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18023451784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18602226720).

18023451784 is an abundant number, since it is smaller than the sum of its proper divisors (19181001656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18023451784 is a wasteful number, since it uses less digits than its factorization.

18023451784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11030 (or 11026 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 18023451784 in words is "eighteen billion, twenty-three million, four hundred fifty-one thousand, seven hundred eighty-four".