18163685349 has 20 divisors (see below), whose sum is σ = 27246022540. Its totient is φ = 12058865280.

The previous prime is 18163685347. The next prime is 18163685381. The reversal of 18163685349 is 94358636181.

18163685349 is a `hidden beast` number, since 181 + 63 + 68 + 5 + 349 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14049360900 + 4114324449 = 118530^2 + 64143^2 .

It is not a de Polignac number, because 18163685349 - 2¹ = 18163685347 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18163685295 and 18163685304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18163685347) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 445714 + ... + 484755.

It is an arithmetic number, because the mean of its divisors is an integer number (1362301127).

Almost surely, 2^18163685349 is an apocalyptic number.

It is an amenable number.

18163685349 is a deficient number, since it is larger than the sum of its proper divisors (9082337191).

18163685349 is an equidigital number, since it uses as much as digits as its factorization.

18163685349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930722 (or 930713 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 18163685349 in words is "eighteen billion, one hundred sixty-three million, six hundred eighty-five thousand, three hundred forty-nine".