40565636121 has 4 divisors (see below), whose sum is σ = 54087514832. Its totient is φ = 27043757412.

The previous prime is 40565636053. The next prime is 40565636123. The reversal of 40565636121 is 12163656504.

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 40565636121 - 2²⁹ = 40028765209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40565636121.

It is not an unprimeable number, because it can be changed into a prime (40565636123) 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, 6760939351 + ... + 6760939356.

It is an arithmetic number, because the mean of its divisors is an integer number (13521878708).

Almost surely, 2^40565636121 is an apocalyptic number.

It is an amenable number.

40565636121 is a deficient number, since it is larger than the sum of its proper divisors (13521878711).

40565636121 is a wasteful number, since it uses less digits than its factorization.

40565636121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13521878710.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 40565636121 in words is "forty billion, five hundred sixty-five million, six hundred thirty-six thousand, one hundred twenty-one".