3561665033 has 4 divisors (see below), whose sum is σ = 3561810708. Its totient is φ = 3561519360.

The previous prime is 3561665021. The next prime is 3561665047. The reversal of 3561665033 is 3305661653.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3305661653 = 7 ⋅472237379.

It can be written as a sum of positive squares in 2 ways, for example, as 2454905209 + 1106759824 = 49547^2 + 33268^2 .

It is a cyclic number.

It is not a de Polignac number, because 3561665033 - 2²⁰ = 3560616457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3561665633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26216 + ... + 88377.

It is an arithmetic number, because the mean of its divisors is an integer number (890452677).

Almost surely, 2^3561665033 is an apocalyptic number.

It is an amenable number.

3561665033 is a deficient number, since it is larger than the sum of its proper divisors (145675).

3561665033 is a wasteful number, since it uses less digits than its factorization.

3561665033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145674.

The product of its (nonzero) digits is 145800, while the sum is 38.

The square root of 3561665033 is about 59679.6869378518. The cubic root of 3561665033 is about 1527.1593572356.

The spelling of 3561665033 in words is "three billion, five hundred sixty-one million, six hundred sixty-five thousand, thirty-three".