18218178396 has 96 divisors (see below), whose sum is σ = 51555571200. Its totient is φ = 5517509760.

The previous prime is 18218178389. The next prime is 18218178397. The reversal of 18218178396 is 69387181281.

18218178396 is a `hidden beast` number, since 1 + 8 + 2 + 181 + 78 + 396 = 666.

It is a super-2 number, since 2×18218178396² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218178397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2875360 + ... + 2881688.

It is an arithmetic number, because the mean of its divisors is an integer number (537037200).

Almost surely, 2^18218178396 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 18218178396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25777785600).

18218178396 is an abundant number, since it is smaller than the sum of its proper divisors (33337392804).

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

18218178396 is a wasteful number, since it uses less digits than its factorization.

18218178396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8776 (or 8768 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The spelling of 18218178396 in words is "eighteen billion, two hundred eighteen million, one hundred seventy-eight thousand, three hundred ninety-six".