18436905049 has 8 divisors (see below), whose sum is σ = 19049349312. Its totient is φ = 17834260080.

The previous prime is 18436905007. The next prime is 18436905079. The reversal of 18436905049 is 94050963481.

It is a happy number.

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 18436905049 - 2⁹ = 18436904537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18436904993 and 18436905011.

It is not an unprimeable number, because it can be changed into a prime (18436905079) 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, 2445999 + ... + 2453524.

It is an arithmetic number, because the mean of its divisors is an integer number (2381168664).

Almost surely, 2^18436905049 is an apocalyptic number.

It is an amenable number.

18436905049 is a deficient number, since it is larger than the sum of its proper divisors (612444263).

18436905049 is an equidigital number, since it uses as much as digits as its factorization.

18436905049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4899647.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 18436905049 in words is "eighteen billion, four hundred thirty-six million, nine hundred five thousand, forty-nine".