40344440161 has 2 divisors, whose sum is σ = 40344440162. Its totient is φ = 40344440160.

The previous prime is 40344440159. The next prime is 40344440177. The reversal of 40344440161 is 16104444304.

40344440161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40262429025 + 82011136 = 200655^2 + 9056^2 .

It is a cyclic number.

It is not a de Polignac number, because 40344440161 - 2¹ = 40344440159 is a prime.

Together with 40344440159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40344440561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20172220080 + 20172220081.

It is an arithmetic number, because the mean of its divisors is an integer number (20172220081).

Almost surely, 2^40344440161 is an apocalyptic number.

It is an amenable number.

40344440161 is a deficient number, since it is larger than the sum of its proper divisors (1).

40344440161 is an equidigital number, since it uses as much as digits as its factorization.

40344440161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 40344440161 its reverse (16104444304), we get a palindrome (56448884465).

The spelling of 40344440161 in words is "forty billion, three hundred forty-four million, four hundred forty thousand, one hundred sixty-one".