18336409745 has 4 divisors (see below), whose sum is σ = 22003691700. Its totient is φ = 14669127792.

The previous prime is 18336409709. The next prime is 18336409747. The reversal of 18336409745 is 54790463381.

It is a Cunningham number, because it is equal to 135412²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6601237504 + 11735172241 = 81248^2 + 108329^2 .

It is a cyclic number.

It is not a de Polignac number, because 18336409745 - 2²² = 18332215441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18336409693 and 18336409702.

It is not an unprimeable number, because it can be changed into a prime (18336409747) 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, 1833640970 + ... + 1833640979.

It is an arithmetic number, because the mean of its divisors is an integer number (5500922925).

Almost surely, 2^18336409745 is an apocalyptic number.

It is an amenable number.

18336409745 is a deficient number, since it is larger than the sum of its proper divisors (3667281955).

18336409745 is an equidigital number, since it uses as much as digits as its factorization.

18336409745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667281954.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 18336409745 in words is "eighteen billion, three hundred thirty-six million, four hundred nine thousand, seven hundred forty-five".