3206868561 has 24 divisors (see below), whose sum is σ = 4990667136. Its totient is φ = 1972585440.

The previous prime is 3206868523. The next prime is 3206868569. The reversal of 3206868561 is 1658686023.

3206868561 is a `hidden beast` number, since 3 + 2 + 0 + 6 + 86 + 8 + 561 = 666.

It is not a de Polignac number, because 3206868561 - 2⁷ = 3206868433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3206868569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 347736 + ... + 356838.

It is an arithmetic number, because the mean of its divisors is an integer number (207944464).

Almost surely, 2^3206868561 is an apocalyptic number.

It is an amenable number.

3206868561 is a deficient number, since it is larger than the sum of its proper divisors (1783798575).

3206868561 is a wasteful number, since it uses less digits than its factorization.

3206868561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12133 (or 12130 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 3206868561 is about 56629.2200281798. The cubic root of 3206868561 is about 1474.6661791334. Note that the first 3 decimals are identical.

The spelling of 3206868561 in words is "three billion, two hundred six million, eight hundred sixty-eight thousand, five hundred sixty-one".