3995661817 has 8 divisors (see below), whose sum is σ = 4630787712. Its totient is φ = 3376615200.

The previous prime is 3995661811. The next prime is 3995661841. The reversal of 3995661817 is 7181665993.

It is a happy number.

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

It is not a de Polignac number, because 3995661817 - 2⁷ = 3995661689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3995661811) 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, 4019284 + ... + 4020277.

It is an arithmetic number, because the mean of its divisors is an integer number (578848464).

Almost surely, 2^3995661817 is an apocalyptic number.

It is an amenable number.

3995661817 is a deficient number, since it is larger than the sum of its proper divisors (635125895).

3995661817 is an equidigital number, since it uses as much as digits as its factorization.

3995661817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8039639.

The product of its digits is 2449440, while the sum is 55.

The square root of 3995661817 is about 63211.2475513654. The cubic root of 3995661817 is about 1586.8269746923.

The spelling of 3995661817 in words is "three billion, nine hundred ninety-five million, six hundred sixty-one thousand, eight hundred seventeen".