18667843491 has 32 divisors (see below), whose sum is σ = 27547349760. Its totient is φ = 11150294400.

The previous prime is 18667843477. The next prime is 18667843573. The reversal of 18667843491 is 19434876681.

It is not a de Polignac number, because 18667843491 - 2⁶ = 18667843427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18667843421) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1145025 + ... + 1161213.

It is an arithmetic number, because the mean of its divisors is an integer number (860854680).

Almost surely, 2^18667843491 is an apocalyptic number.

18667843491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18667843491 is a deficient number, since it is larger than the sum of its proper divisors (8879506269).

18667843491 is a wasteful number, since it uses less digits than its factorization.

18667843491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16707.

The product of its digits is 6967296, while the sum is 57.

The spelling of 18667843491 in words is "eighteen billion, six hundred sixty-seven million, eight hundred forty-three thousand, four hundred ninety-one".