4045043561 has 6 divisors (see below), whose sum is σ = 4380136110. Its totient is φ = 3733886208.

The previous prime is 4045043549. The next prime is 4045043609. The reversal of 4045043561 is 1653405404.

It can be written as a sum of positive squares in 3 ways, for example, as 341103961 + 3703939600 = 18469^2 + 60860^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4045043561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4045043521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11967416 + ... + 11967753.

It is an arithmetic number, because the mean of its divisors is an integer number (730022685).

Almost surely, 2^4045043561 is an apocalyptic number.

It is an amenable number.

4045043561 is a deficient number, since it is larger than the sum of its proper divisors (335092549).

4045043561 is a wasteful number, since it uses less digits than its factorization.

4045043561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23935195 (or 23935182 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 4045043561 is about 63600.6569227080. The cubic root of 4045043561 is about 1593.3373411264.

Adding to 4045043561 its reverse (1653405404), we get a palindrome (5698448965).

The spelling of 4045043561 in words is "four billion, forty-five million, forty-three thousand, five hundred sixty-one".