18494532247 has 4 divisors (see below), whose sum is σ = 18495613936. Its totient is φ = 18493450560.

The previous prime is 18494532229. The next prime is 18494532253. The reversal of 18494532247 is 74223549481.

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

It is a cyclic number.

It is not a de Polignac number, because 18494532247 - 2²⁷ = 18360314519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18494532247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18494532347) 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 in 3 ways as a sum of consecutive naturals, for example, 514779 + ... + 549532.

It is an arithmetic number, because the mean of its divisors is an integer number (4623903484).

Almost surely, 2^18494532247 is an apocalyptic number.

18494532247 is a deficient number, since it is larger than the sum of its proper divisors (1081689).

18494532247 is a wasteful number, since it uses less digits than its factorization.

18494532247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081688.

The product of its digits is 1935360, while the sum is 49.

The spelling of 18494532247 in words is "eighteen billion, four hundred ninety-four million, five hundred thirty-two thousand, two hundred forty-seven".