3817820665 has 8 divisors (see below), whose sum is σ = 4587052680. Its totient is φ = 3050477952.

The previous prime is 3817820663. The next prime is 3817820683. The reversal of 3817820665 is 5660287183.

It can be written as a sum of positive squares in 4 ways, for example, as 338118544 + 3479702121 = 18388^2 + 58989^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3817820665 - 2¹ = 3817820663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3817820663) 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 7 ways as a sum of consecutive naturals, for example, 467874 + ... + 475963.

It is an arithmetic number, because the mean of its divisors is an integer number (573381585).

Almost surely, 2^3817820665 is an apocalyptic number.

It is an amenable number.

3817820665 is a deficient number, since it is larger than the sum of its proper divisors (769232015).

3817820665 is an equidigital number, since it uses as much as digits as its factorization.

3817820665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944651.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 3817820665 is about 61788.5156400443. The cubic root of 3817820665 is about 1562.9263317918.

The spelling of 3817820665 in words is "three billion, eight hundred seventeen million, eight hundred twenty thousand, six hundred sixty-five".