18814999636 has 12 divisors (see below), whose sum is σ = 32927508180. Its totient is φ = 9407140160.

The previous prime is 18814999631. The next prime is 18814999657. The reversal of 18814999636 is 63699941881.

It can be written as a sum of positive squares in 2 ways, for example, as 4159476036 + 14655523600 = 64494^2 + 121060^2 .

It is a super-2 number, since 2×18814999636² (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 (18814999631) 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, 53046 + ... + 201106.

It is an arithmetic number, because the mean of its divisors is an integer number (2743959015).

Almost surely, 2^18814999636 is an apocalyptic number.

It is an amenable number.

18814999636 is a deficient number, since it is larger than the sum of its proper divisors (14112508544).

18814999636 is a wasteful number, since it uses less digits than its factorization.

18814999636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179834 (or 179832 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 64.

The spelling of 18814999636 in words is "eighteen billion, eight hundred fourteen million, nine hundred ninety-nine thousand, six hundred thirty-six".