3644541561 has 4 divisors (see below), whose sum is σ = 4859388752. Its totient is φ = 2429694372.

The previous prime is 3644541559. The next prime is 3644541611. The reversal of 3644541561 is 1651454463.

3644541561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3644541561 - 2¹ = 3644541559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3644540561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607423591 + ... + 607423596.

It is an arithmetic number, because the mean of its divisors is an integer number (1214847188).

Almost surely, 2^3644541561 is an apocalyptic number.

It is an amenable number.

3644541561 is a deficient number, since it is larger than the sum of its proper divisors (1214847191).

3644541561 is a wasteful number, since it uses less digits than its factorization.

3644541561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214847190.

The product of its digits is 172800, while the sum is 39.

The square root of 3644541561 is about 60370.0386035987. The cubic root of 3644541561 is about 1538.9138291670.

The spelling of 3644541561 in words is "three billion, six hundred forty-four million, five hundred forty-one thousand, five hundred sixty-one".