3243561561 has 12 divisors (see below), whose sum is σ = 4686077760. Its totient is φ = 2161943640.

The previous prime is 3243561557. The next prime is 3243561583. The reversal of 3243561561 is 1651653423.

3243561561 is a `hidden beast` number, since 3 + 2 + 4 + 35 + 61 + 561 = 666.

It is not a de Polignac number, because 3243561561 - 2² = 3243561557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3243561511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15700 + ... + 82058.

It is an arithmetic number, because the mean of its divisors is an integer number (390506480).

Almost surely, 2^3243561561 is an apocalyptic number.

It is an amenable number.

3243561561 is a deficient number, since it is larger than the sum of its proper divisors (1442516199).

3243561561 is a wasteful number, since it uses less digits than its factorization.

3243561561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71796 (or 71793 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 3243561561 is about 56952.2744146360. The cubic root of 3243561561 is about 1480.2692414050.

The spelling of 3243561561 in words is "three billion, two hundred forty-three million, five hundred sixty-one thousand, five hundred sixty-one".