18291918182 has 4 divisors (see below), whose sum is σ = 27437877276. Its totient is φ = 9145959090.

The previous prime is 18291918137. The next prime is 18291918199. The reversal of 18291918182 is 28181919281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28181919281 = 1373 ⋅20525797.

It is a self number, because there is not a number n which added to its sum of digits gives 18291918182.

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, 4572979544 + ... + 4572979547.

It is an arithmetic number, because the mean of its divisors is an integer number (6859469319).

Almost surely, 2^18291918182 is an apocalyptic number.

18291918182 is a deficient number, since it is larger than the sum of its proper divisors (9145959094).

18291918182 is an equidigital number, since it uses as much as digits as its factorization.

18291918182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9145959093.

The product of its digits is 165888, while the sum is 50.

The spelling of 18291918182 in words is "eighteen billion, two hundred ninety-one million, nine hundred eighteen thousand, one hundred eighty-two".