18222461784 has 160 divisors (see below), whose sum is σ = 53819832000. Its totient is φ = 5744426688.

The previous prime is 18222461773. The next prime is 18222461813. The reversal of 18222461784 is 48716422281.

18222461784 is a `hidden beast` number, since 1 + 8 + 2 + 2 + 24 + 617 + 8 + 4 = 666.

It is a super-2 number, since 2×18222461784² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10575147 + ... + 10576869.

It is an arithmetic number, because the mean of its divisors is an integer number (336373950).

Almost surely, 2^18222461784 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 18222461784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26909916000).

18222461784 is an abundant number, since it is smaller than the sum of its proper divisors (35597370216).

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

18222461784 is a wasteful number, since it uses less digits than its factorization.

18222461784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619 (or 2606 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The spelling of 18222461784 in words is "eighteen billion, two hundred twenty-two million, four hundred sixty-one thousand, seven hundred eighty-four".