18685438484 has 6 divisors (see below), whose sum is σ = 32699517354. Its totient is φ = 9342719240.

The previous prime is 18685438481. The next prime is 18685438501. The reversal of 18685438484 is 48483458681.

It can be written as a sum of positive squares in only one way, i.e., 14918179600 + 3767258884 = 122140^2 + 61378^2 .

It is a super-2 number, since 2×18685438484² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18685438481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2335679807 + ... + 2335679814.

It is an arithmetic number, because the mean of its divisors is an integer number (5449919559).

Almost surely, 2^18685438484 is an apocalyptic number.

It is an amenable number.

18685438484 is a deficient number, since it is larger than the sum of its proper divisors (14014078870).

18685438484 is a wasteful number, since it uses less digits than its factorization.

18685438484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671359625 (or 4671359623 counting only the distinct ones).

The product of its digits is 23592960, while the sum is 59.

The spelling of 18685438484 in words is "eighteen billion, six hundred eighty-five million, four hundred thirty-eight thousand, four hundred eighty-four".