3655998216 has 144 divisors (see below), whose sum is σ = 11061168300. Its totient is φ = 1083172608.

The previous prime is 3655998211. The next prime is 3655998233. The reversal of 3655998216 is 6128995563.

It is a happy number.

3655998216 is a `hidden beast` number, since 3 + 6 + 559 + 9 + 82 + 1 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3534778116 + 121220100 = 59454^2 + 11010^2 .

It is not an unprimeable number, because it can be changed into a prime (3655998211) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9961665 + ... + 9962031.

Almost surely, 2^3655998216 is an apocalyptic number.

3655998216 is a gapful number since it is divisible by the number (36) 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 3655998216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5530584150).

3655998216 is an abundant number, since it is smaller than the sum of its proper divisors (7405170084).

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

3655998216 is a wasteful number, since it uses less digits than its factorization.

3655998216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788 (or 414 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The square root of 3655998216 is about 60464.8510789533. The cubic root of 3655998216 is about 1540.5246730834.

The spelling of 3655998216 in words is "three billion, six hundred fifty-five million, nine hundred ninety-eight thousand, two hundred sixteen".