18066306091 has 4 divisors (see below), whose sum is σ = 18554584672. Its totient is φ = 17578027512.

The previous prime is 18066306019. The next prime is 18066306103. The reversal of 18066306091 is 19060366081.

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 18066306091 - 2¹⁹ = 18065781803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18066306191) 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, 244139235 + ... + 244139308.

It is an arithmetic number, because the mean of its divisors is an integer number (4638646168).

Almost surely, 2^18066306091 is an apocalyptic number.

18066306091 is a deficient number, since it is larger than the sum of its proper divisors (488278581).

18066306091 is an equidigital number, since it uses as much as digits as its factorization.

18066306091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488278580.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 18066306091 in words is "eighteen billion, sixty-six million, three hundred six thousand, ninety-one".