18091194212 has 48 divisors (see below), whose sum is σ = 38987880960. Its totient is φ = 7152872832.

The previous prime is 18091194193. The next prime is 18091194301. The reversal of 18091194212 is 21249119081.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 669989 + ... + 696467.

It is an arithmetic number, because the mean of its divisors is an integer number (812247520).

Almost surely, 2^18091194212 is an apocalyptic number.

It is an amenable number.

18091194212 is an abundant number, since it is smaller than the sum of its proper divisors (20896686748).

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

18091194212 is a wasteful number, since it uses less digits than its factorization.

18091194212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28380 (or 28378 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 18091194212 in words is "eighteen billion, ninety-one million, one hundred ninety-four thousand, two hundred twelve".