40212064181 has 2 divisors, whose sum is σ = 40212064182. Its totient is φ = 40212064180.

The previous prime is 40212064159. The next prime is 40212064213. The reversal of 40212064181 is 18146021204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36425631025 + 3786433156 = 190855^2 + 61534^2 .

It is a cyclic number.

It is not a de Polignac number, because 40212064181 - 2¹⁴ = 40212047797 is a prime.

It is a super-2 number, since 2×40212064181² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40212063181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20106032090 + 20106032091.

It is an arithmetic number, because the mean of its divisors is an integer number (20106032091).

Almost surely, 2^40212064181 is an apocalyptic number.

It is an amenable number.

40212064181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40212064181 is an equidigital number, since it uses as much as digits as its factorization.

40212064181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 29.

Adding to 40212064181 its reverse (18146021204), we get a palindrome (58358085385).

The spelling of 40212064181 in words is "forty billion, two hundred twelve million, sixty-four thousand, one hundred eighty-one".