40505551181 has 2 divisors, whose sum is σ = 40505551182. Its totient is φ = 40505551180.

The previous prime is 40505551159. The next prime is 40505551201. The reversal of 40505551181 is 18115550504.

40505551181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34163977225 + 6341573956 = 184835^2 + 79634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40505551181 is a prime.

It is a super-2 number, since 2×40505551181² (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 (40505554181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20252775590 + 20252775591.

It is an arithmetic number, because the mean of its divisors is an integer number (20252775591).

Almost surely, 2^40505551181 is an apocalyptic number.

It is an amenable number.

40505551181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40505551181 is an equidigital number, since it uses as much as digits as its factorization.

40505551181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20000, while the sum is 35.

The spelling of 40505551181 in words is "forty billion, five hundred five million, five hundred fifty-one thousand, one hundred eighty-one".