181821018283 has 4 divisors (see below), whose sum is σ = 184122550240. Its totient is φ = 179519486328.

The previous prime is 181821018251. The next prime is 181821018287. The reversal of 181821018283 is 382810128181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 181821018283 - 2⁵ = 181821018251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181821018287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150765860 + ... + 1150766017.

It is an arithmetic number, because the mean of its divisors is an integer number (46030637560).

Almost surely, 2^181821018283 is an apocalyptic number.

181821018283 is a deficient number, since it is larger than the sum of its proper divisors (2301531957).

181821018283 is an equidigital number, since it uses as much as digits as its factorization.

181821018283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301531956.

The product of its (nonzero) digits is 49152, while the sum is 43.

The spelling of 181821018283 in words is "one hundred eighty-one billion, eight hundred twenty-one million, eighteen thousand, two hundred eighty-three".