40565440121 has 4 divisors (see below), whose sum is σ = 40967078244. Its totient is φ = 40163802000.

The previous prime is 40565440087. The next prime is 40565440127. The reversal of 40565440121 is 12104456504.

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 33180444025 + 7384996096 = 182155^2 + 85936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40565440121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40565440127) 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, 200818910 + ... + 200819111.

It is an arithmetic number, because the mean of its divisors is an integer number (10241769561).

Almost surely, 2^40565440121 is an apocalyptic number.

It is an amenable number.

40565440121 is a deficient number, since it is larger than the sum of its proper divisors (401638123).

40565440121 is a wasteful number, since it uses less digits than its factorization.

40565440121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401638122.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 40565440121 its reverse (12104456504), we get a palindrome (52669896625).

The spelling of 40565440121 in words is "forty billion, five hundred sixty-five million, four hundred forty thousand, one hundred twenty-one".