18218196906 has 128 divisors (see below), whose sum is σ = 46061568000. Its totient is φ = 4675069440.

The previous prime is 18218196883. The next prime is 18218196907. The reversal of 18218196906 is 60969181281.

18218196906 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18218196907) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10722045 + ... + 10723743.

It is an arithmetic number, because the mean of its divisors is an integer number (359856000).

Almost surely, 2^18218196906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18218196906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23030784000).

18218196906 is an abundant number, since it is smaller than the sum of its proper divisors (27843371094).

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

18218196906 is a wasteful number, since it uses less digits than its factorization.

18218196906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244.

The product of its (nonzero) digits is 373248, while the sum is 51.

The spelling of 18218196906 in words is "eighteen billion, two hundred eighteen million, one hundred ninety-six thousand, nine hundred six".