18641843441 has 8 divisors (see below), whose sum is σ = 20282800104. Its totient is φ = 17030453760.

The previous prime is 18641843431. The next prime is 18641843443. The reversal of 18641843441 is 14434814681.

It can be written as a sum of positive squares in 4 ways, for example, as 2333276416 + 16308567025 = 48304^2 + 127705^2 .

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 18641843441 - 2³⁴ = 1461974257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18641843392 and 18641843401.

It is not an unprimeable number, because it can be changed into a prime (18641843443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7390430 + ... + 7392951.

It is an arithmetic number, because the mean of its divisors is an integer number (2535350013).

Almost surely, 2^18641843441 is an apocalyptic number.

It is an amenable number.

18641843441 is a deficient number, since it is larger than the sum of its proper divisors (1640956663).

18641843441 is a wasteful number, since it uses less digits than its factorization.

18641843441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14783491.

The product of its digits is 294912, while the sum is 44.

The spelling of 18641843441 in words is "eighteen billion, six hundred forty-one million, eight hundred forty-three thousand, four hundred forty-one".