18691414187 has 4 divisors (see below), whose sum is σ = 18731960016. Its totient is φ = 18650868360.

The previous prime is 18691414153. The next prime is 18691414199. The reversal of 18691414187 is 78141419681.

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 18691414187 - 2²⁰ = 18690365611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18691434187) 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, 20272223 + ... + 20273144.

It is an arithmetic number, because the mean of its divisors is an integer number (4682990004).

Almost surely, 2^18691414187 is an apocalyptic number.

18691414187 is a deficient number, since it is larger than the sum of its proper divisors (40545829).

18691414187 is an equidigital number, since it uses as much as digits as its factorization.

18691414187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40545828.

The product of its digits is 387072, while the sum is 50.

The spelling of 18691414187 in words is "eighteen billion, six hundred ninety-one million, four hundred fourteen thousand, one hundred eighty-seven".