18363841649 has 8 divisors (see below), whose sum is σ = 18529264512. Its totient is φ = 18198470080.

The previous prime is 18363841637. The next prime is 18363841673. The reversal of 18363841649 is 94614836381.

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 18363841649 - 2¹⁶ = 18363776113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18363841649.

It is not an unprimeable number, because it can be changed into a prime (18363841619) 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 7 ways as a sum of consecutive naturals, for example, 1357292 + ... + 1370754.

It is an arithmetic number, because the mean of its divisors is an integer number (2316158064).

Almost surely, 2^18363841649 is an apocalyptic number.

It is an amenable number.

18363841649 is a deficient number, since it is larger than the sum of its proper divisors (165422863).

18363841649 is a wasteful number, since it uses less digits than its factorization.

18363841649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25647.

The product of its digits is 2985984, while the sum is 53.

The spelling of 18363841649 in words is "eighteen billion, three hundred sixty-three million, eight hundred forty-one thousand, six hundred forty-nine".