18219840182 has 4 divisors (see below), whose sum is σ = 27329760276. Its totient is φ = 9109920090.

The previous prime is 18219840167. The next prime is 18219840229. The reversal of 18219840182 is 28104891281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28104891281 = 347 ⋅80993923.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4554960044 + ... + 4554960047.

It is an arithmetic number, because the mean of its divisors is an integer number (6832440069).

Almost surely, 2^18219840182 is an apocalyptic number.

18219840182 is a deficient number, since it is larger than the sum of its proper divisors (9109920094).

18219840182 is an equidigital number, since it uses as much as digits as its factorization.

18219840182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9109920093.

The product of its (nonzero) digits is 73728, while the sum is 44.

The spelling of 18219840182 in words is "eighteen billion, two hundred nineteen million, eight hundred forty thousand, one hundred eighty-two".