18643686119 has 4 divisors (see below), whose sum is σ = 18644099760. Its totient is φ = 18643272480.

The previous prime is 18643686097. The next prime is 18643686121. The reversal of 18643686119 is 91168634681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91168634681 = 2969 ⋅30706849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18643686119 is a prime.

It is a super-2 number, since 2×18643686119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18643686619) 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, 129602 + ... + 232559.

It is an arithmetic number, because the mean of its divisors is an integer number (4661024940).

Almost surely, 2^18643686119 is an apocalyptic number.

18643686119 is a deficient number, since it is larger than the sum of its proper divisors (413641).

18643686119 is an equidigital number, since it uses as much as digits as its factorization.

18643686119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413640.

The product of its digits is 1492992, while the sum is 53.

The spelling of 18643686119 in words is "eighteen billion, six hundred forty-three million, six hundred eighty-six thousand, one hundred nineteen".