40845440821 has 4 divisors (see below), whose sum is σ = 41949371692. Its totient is φ = 39741509952.

The previous prime is 40845440809. The next prime is 40845440827. The reversal of 40845440821 is 12804454804.

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 14229149796 + 26616291025 = 119286^2 + 163145^2 .

It is a cyclic number.

It is not a de Polignac number, because 40845440821 - 2⁵ = 40845440789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40845440827) 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, 551965380 + ... + 551965453.

It is an arithmetic number, because the mean of its divisors is an integer number (10487342923).

Almost surely, 2^40845440821 is an apocalyptic number.

It is an amenable number.

40845440821 is a deficient number, since it is larger than the sum of its proper divisors (1103930871).

40845440821 is a wasteful number, since it uses less digits than its factorization.

40845440821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103930870.

The product of its (nonzero) digits is 163840, while the sum is 40.

The spelling of 40845440821 in words is "forty billion, eight hundred forty-five million, four hundred forty thousand, eight hundred twenty-one".