3818649665 has 8 divisors (see below), whose sum is σ = 4585909608. Its totient is φ = 3052566400.

The previous prime is 3818649661. The next prime is 3818649671. The reversal of 3818649665 is 5669468183.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5216656 + 3813433009 = 2284^2 + 61753^2 .

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

It is not a de Polignac number, because 3818649665 - 2² = 3818649661 is a prime.

It is a super-2 number, since 2×3818649665² = 29164170528009224450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3818649665.

It is not an unprimeable number, because it can be changed into a prime (3818649661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287012 + ... + 300021.

It is an arithmetic number, because the mean of its divisors is an integer number (573238701).

Almost surely, 2^3818649665 is an apocalyptic number.

It is an amenable number.

3818649665 is a deficient number, since it is larger than the sum of its proper divisors (767259943).

3818649665 is a wasteful number, since it uses less digits than its factorization.

3818649665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588339.

The product of its digits is 7464960, while the sum is 56.

The square root of 3818649665 is about 61795.2236422848. The cubic root of 3818649665 is about 1563.0394479972.

The spelling of 3818649665 in words is "three billion, eight hundred eighteen million, six hundred forty-nine thousand, six hundred sixty-five".