3995661816 has 48 divisors (see below), whose sum is σ = 10824755760. Its totient is φ = 1331496960.

The previous prime is 3995661811. The next prime is 3995661841. The reversal of 3995661816 is 6181665993.

3995661816 is a `hidden beast` number, since 3 + 9 + 9 + 5 + 6 + 618 + 16 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3995661811) by changing a digit.

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, 345016 + ... + 356408.

It is an arithmetic number, because the mean of its divisors is an integer number (225515745).

Almost surely, 2^3995661816 is an apocalyptic number.

3995661816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3995661816 is an abundant number, since it is smaller than the sum of its proper divisors (6829093944).

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

3995661816 is a wasteful number, since it uses less digits than its factorization.

3995661816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16276 (or 16269 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 3995661816 is about 63211.2475434554. The cubic root of 3995661816 is about 1586.8269745599.

The spelling of 3995661816 in words is "three billion, nine hundred ninety-five million, six hundred sixty-one thousand, eight hundred sixteen".