40243025521 has 4 divisors (see below), whose sum is σ = 40612227700. Its totient is φ = 39873823344.

The previous prime is 40243025519. The next prime is 40243025531. The reversal of 40243025521 is 12552034204.

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 23420935521 + 16822090000 = 153039^2 + 129700^2 .

It is a cyclic number.

It is not a de Polignac number, because 40243025521 - 2¹ = 40243025519 is a prime.

It is a super-2 number, since 2×40243025521² (a number of 22 digits) contains 22 as substring.

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 40243025521.

It is not an unprimeable number, because it can be changed into a prime (40243025531) 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, 184600926 + ... + 184601143.

It is an arithmetic number, because the mean of its divisors is an integer number (10153056925).

Almost surely, 2^40243025521 is an apocalyptic number.

It is an amenable number.

40243025521 is a deficient number, since it is larger than the sum of its proper divisors (369202179).

40243025521 is a wasteful number, since it uses less digits than its factorization.

40243025521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369202178.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 40243025521 its reverse (12552034204), we get a palindrome (52795059725).

The spelling of 40243025521 in words is "forty billion, two hundred forty-three million, twenty-five thousand, five hundred twenty-one".