181218203268 has 144 divisors (see below), whose sum is σ = 466378080000. Its totient is φ = 54610839360.

The previous prime is 181218203267. The next prime is 181218203273. The reversal of 181218203268 is 862302812181.

It is not an unprimeable number, because it can be changed into a prime (181218203261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60183883 + ... + 60186893.

Almost surely, 2^181218203268 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 181218203268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233189040000).

181218203268 is an abundant number, since it is smaller than the sum of its proper divisors (285159876732).

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

181218203268 is a wasteful number, since it uses less digits than its factorization.

181218203268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582 (or 3557 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The spelling of 181218203268 in words is "one hundred eighty-one billion, two hundred eighteen million, two hundred three thousand, two hundred sixty-eight".