18817553449 has 8 divisors (see below), whose sum is σ = 18901602720. Its totient is φ = 18733692096.

The previous prime is 18817553423. The next prime is 18817553459. The reversal of 18817553449 is 94435571881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18817553449 - 2¹⁵ = 18817520681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18817553449.

It is not an unprimeable number, because it can be changed into a prime (18817553459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155682 + ... + 248740.

It is an arithmetic number, because the mean of its divisors is an integer number (2362700340).

Almost surely, 2^18817553449 is an apocalyptic number.

It is an amenable number.

18817553449 is a deficient number, since it is larger than the sum of its proper divisors (84049271).

18817553449 is an equidigital number, since it uses as much as digits as its factorization.

18817553449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93959.

The product of its digits is 4838400, while the sum is 55.

The spelling of 18817553449 in words is "eighteen billion, eight hundred seventeen million, five hundred fifty-three thousand, four hundred forty-nine".