4040207561 has 8 divisors (see below), whose sum is σ = 4443567744. Its totient is φ = 3650072400.

The previous prime is 4040207551. The next prime is 4040207569. The reversal of 4040207561 is 1657020404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4040207561 - 2¹⁰ = 4040206537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4040207569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3305615 + ... + 3306836.

It is an arithmetic number, because the mean of its divisors is an integer number (555445968).

Almost surely, 2^4040207561 is an apocalyptic number.

It is an amenable number.

4040207561 is a deficient number, since it is larger than the sum of its proper divisors (403360183).

4040207561 is a wasteful number, since it uses less digits than its factorization.

4040207561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6612511.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 4040207561 is about 63562.6270775524. The cubic root of 4040207561 is about 1592.7021232360.

Adding to 4040207561 its reverse (1657020404), we get a palindrome (5697227965).

The spelling of 4040207561 in words is "four billion, forty million, two hundred seven thousand, five hundred sixty-one".