40440362561 has 4 divisors (see below), whose sum is σ = 40584278724. Its totient is φ = 40296446400.

The previous prime is 40440362503. The next prime is 40440362563. The reversal of 40440362561 is 16526304404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30060624400 + 10379738161 = 173380^2 + 101881^2 .

It is a cyclic number.

It is not a de Polignac number, because 40440362561 - 2¹⁸ = 40440100417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40440362563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71957660 + ... + 71958221.

It is an arithmetic number, because the mean of its divisors is an integer number (10146069681).

Almost surely, 2^40440362561 is an apocalyptic number.

It is an amenable number.

40440362561 is a deficient number, since it is larger than the sum of its proper divisors (143916163).

40440362561 is a wasteful number, since it uses less digits than its factorization.

40440362561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143916162.

The product of its (nonzero) digits is 69120, while the sum is 35.

Adding to 40440362561 its reverse (16526304404), we get a palindrome (56966666965).

The spelling of 40440362561 in words is "forty billion, four hundred forty million, three hundred sixty-two thousand, five hundred sixty-one".