18636973212 has 216 divisors, whose sum is σ = 52772014512. Its totient is φ = 5111208960.

The previous prime is 18636973189. The next prime is 18636973247. The reversal of 18636973212 is 21237963681.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 13004848 + ... + 13006280.

It is an arithmetic number, because the mean of its divisors is an integer number (244314882).

Almost surely, 2^18636973212 is an apocalyptic number.

18636973212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18636973212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26386007256).

18636973212 is an abundant number, since it is smaller than the sum of its proper divisors (34135041300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18636973212 is a wasteful number, since it uses less digits than its factorization.

18636973212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541 (or 1515 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The spelling of 18636973212 in words is "eighteen billion, six hundred thirty-six million, nine hundred seventy-three thousand, two hundred twelve".