40641162612181 has 2 divisors, whose sum is σ = 40641162612182. Its totient is φ = 40641162612180.

The previous prime is 40641162612163. The next prime is 40641162612251. The reversal of 40641162612181 is 18121626114604.

40641162612181 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., 36796465188081 + 3844697424100 = 6066009^2 + 1960790^2 .

It is a cyclic number.

It is not a de Polignac number, because 40641162612181 - 2¹⁷ = 40641162481109 is a prime.

It is a super-2 number, since 2×40641162612181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40641162612121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20320581306090 + 20320581306091.

It is an arithmetic number, because the mean of its divisors is an integer number (20320581306091).

Almost surely, 2^{40641162612181} is an apocalyptic number.

It is an amenable number.

40641162612181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40641162612181 is an equidigital number, since it uses as much as digits as its factorization.

40641162612181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 43.

Adding to 40641162612181 its reverse (18121626114604), we get a palindrome (58762788726785).

The spelling of 40641162612181 in words is "forty trillion, six hundred forty-one billion, one hundred sixty-two million, six hundred twelve thousand, one hundred eighty-one".