18409585426 has 4 divisors (see below), whose sum is σ = 27614378142. Its totient is φ = 9204792712.

The previous prime is 18409585391. The next prime is 18409585427. The reversal of 18409585426 is 62458590481.

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

It can be written as a sum of positive squares in only one way, i.e., 18105048025 + 304537401 = 134555^2 + 17451^2 .

It is not an unprimeable number, because it can be changed into a prime (18409585427) 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 as a sum of consecutive naturals, namely, 4602396355 + ... + 4602396358.

Almost surely, 2^18409585426 is an apocalyptic number.

18409585426 is a deficient number, since it is larger than the sum of its proper divisors (9204792716).

18409585426 is an equidigital number, since it uses as much as digits as its factorization.

18409585426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9204792715.

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 18409585426 in words is "eighteen billion, four hundred nine million, five hundred eighty-five thousand, four hundred twenty-six".