3561552261 has 20 divisors (see below), whose sum is σ = 5600364000. Its totient is φ = 2249400456.

The previous prime is 3561552233. The next prime is 3561552311. The reversal of 3561552261 is 1622551653.

3561552261 is a `hidden beast` number, since 35 + 615 + 5 + 2 + 2 + 6 + 1 = 666.

It is not a de Polignac number, because 3561552261 - 2²⁵ = 3527997829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561542261) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1155561 + ... + 1158638.

It is an arithmetic number, because the mean of its divisors is an integer number (280018200).

Almost surely, 2^3561552261 is an apocalyptic number.

It is an amenable number.

3561552261 is a deficient number, since it is larger than the sum of its proper divisors (2038811739).

3561552261 is a wasteful number, since it uses less digits than its factorization.

3561552261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2314230 (or 2314221 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 3561552261 is about 59678.7421197867. The cubic root of 3561552261 is about 1527.1432390595.

The spelling of 3561552261 in words is "three billion, five hundred sixty-one million, five hundred fifty-two thousand, two hundred sixty-one".