18645953089 has 4 divisors (see below), whose sum is σ = 18646253956. Its totient is φ = 18645652224.

The previous prime is 18645953059. The next prime is 18645953093. The reversal of 18645953089 is 98035954681.

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 3018953025 + 15627000064 = 54945^2 + 125008^2 .

It is a cyclic number.

It is not a de Polignac number, because 18645953089 - 2³¹ = 16498469441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18645953009) 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, 19464 + ... + 194089.

It is an arithmetic number, because the mean of its divisors is an integer number (4661563489).

Almost surely, 2^18645953089 is an apocalyptic number.

It is an amenable number.

18645953089 is a deficient number, since it is larger than the sum of its proper divisors (300867).

18645953089 is an equidigital number, since it uses as much as digits as its factorization.

18645953089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300866.

The product of its (nonzero) digits is 9331200, while the sum is 58.

The spelling of 18645953089 in words is "eighteen billion, six hundred forty-five million, nine hundred fifty-three thousand, eighty-nine".