18383382945 has 20 divisors (see below), whose sum is σ = 32953916820. Its totient is φ = 9804470688.

The previous prime is 18383382931. The next prime is 18383382947. The reversal of 18383382945 is 54928338381.

18383382945 is a `hidden beast` number, since 18 + 3 + 8 + 338 + 294 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2400608016 + 15982774929 = 48996^2 + 126423^2 .

It is not a de Polignac number, because 18383382945 - 2¹⁰ = 18383381921 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18383382891 and 18383382900.

It is not an unprimeable number, because it can be changed into a prime (18383382947) 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, 22695130 + ... + 22695939.

It is an arithmetic number, because the mean of its divisors is an integer number (1647695841).

Almost surely, 2^18383382945 is an apocalyptic number.

18383382945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18383382945 is a deficient number, since it is larger than the sum of its proper divisors (14570533875).

18383382945 is an equidigital number, since it uses as much as digits as its factorization.

18383382945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45391086 (or 45391077 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 18383382945 in words is "eighteen billion, three hundred eighty-three million, three hundred eighty-two thousand, nine hundred forty-five".