40404040181 has 2 divisors, whose sum is σ = 40404040182. Its totient is φ = 40404040180.

The previous prime is 40404040153. The next prime is 40404040211. The reversal of 40404040181 is 18104040404.

It is a happy number.

40404040181 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., 22492500625 + 17911539556 = 149975^2 + 133834^2 .

It is a cyclic number.

It is not a de Polignac number, because 40404040181 - 2¹⁴ = 40404023797 is a prime.

It is a super-2 number, since 2×40404040181² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40404040181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40404040081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202020090 + 20202020091.

It is an arithmetic number, because the mean of its divisors is an integer number (20202020091).

Almost surely, 2^40404040181 is an apocalyptic number.

It is an amenable number.

40404040181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40404040181 is an equidigital number, since it uses as much as digits as its factorization.

40404040181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 26.

Adding to 40404040181 its reverse (18104040404), we get a palindrome (58508080585).

The spelling of 40404040181 in words is "forty billion, four hundred four million, forty thousand, one hundred eighty-one".