3639817818216 has 48 divisors (see below), whose sum is σ = 9874463716260. Its totient is φ = 1211226600960.

The previous prime is 3639817818209. The next prime is 3639817818323. The reversal of 3639817818216 is 6128187189363.

3639817818216 is a `hidden beast` number, since 3 + 6 + 398 + 17 + 8 + 18 + 216 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3064565348100 + 575252470116 = 1750590^2 + 758454^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42582115 + ... + 42667506.

Almost surely, 2^{3639817818216} is an apocalyptic number.

3639817818216 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3639817818216 is an abundant number, since it is smaller than the sum of its proper divisors (6234645898044).

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

3639817818216 is a wasteful number, since it uses less digits than its factorization.

3639817818216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85250226 (or 85250219 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 3639817818216 in words is "three trillion, six hundred thirty-nine billion, eight hundred seventeen million, eight hundred eighteen thousand, two hundred sixteen".