3261218665 has 16 divisors (see below), whose sum is σ = 4025463120. Its totient is φ = 2534526720.

The previous prime is 3261218663. The next prime is 3261218683. The reversal of 3261218665 is 5668121623.

3261218665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1179304281 + 2081914384 = 34341^2 + 45628^2 .

It is not a de Polignac number, because 3261218665 - 2¹ = 3261218663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3261218663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108951 + ... + 135619.

It is an arithmetic number, because the mean of its divisors is an integer number (251591445).

Almost surely, 2^3261218665 is an apocalyptic number.

It is an amenable number.

3261218665 is a deficient number, since it is larger than the sum of its proper divisors (764244455).

3261218665 is a wasteful number, since it uses less digits than its factorization.

3261218665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27372.

The product of its digits is 103680, while the sum is 40.

The square root of 3261218665 is about 57107.0806905764. The cubic root of 3261218665 is about 1482.9504486945.

The spelling of 3261218665 in words is "three billion, two hundred sixty-one million, two hundred eighteen thousand, six hundred sixty-five".