18812502209 has 8 divisors (see below), whose sum is σ = 19949266728. Its totient is φ = 17679087360.

The previous prime is 18812502169. The next prime is 18812502223. The reversal of 18812502209 is 90220521881.

It can be written as a sum of positive squares in 4 ways, for example, as 2557527184 + 16254975025 = 50572^2 + 127495^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18812502209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18812502229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 825842 + ... + 848315.

It is an arithmetic number, because the mean of its divisors is an integer number (2493658341).

Almost surely, 2^18812502209 is an apocalyptic number.

It is an amenable number.

18812502209 is a deficient number, since it is larger than the sum of its proper divisors (1136764519).

18812502209 is a wasteful number, since it uses less digits than its factorization.

18812502209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674835.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 18812502209 in words is "eighteen billion, eight hundred twelve million, five hundred two thousand, two hundred nine".