40005000181 has 2 divisors, whose sum is σ = 40005000182. Its totient is φ = 40005000180.

The previous prime is 40005000149. The next prime is 40005000227. The reversal of 40005000181 is 18100050004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22489801156 + 17515199025 = 149966^2 + 132345^2 .

It is a cyclic number.

It is not a de Polignac number, because 40005000181 - 2⁵ = 40005000149 is a prime.

It is a super-2 number, since 2×40005000181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40005000121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20002500090 + 20002500091.

It is an arithmetic number, because the mean of its divisors is an integer number (20002500091).

Almost surely, 2^40005000181 is an apocalyptic number.

It is an amenable number.

40005000181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40005000181 is an equidigital number, since it uses as much as digits as its factorization.

40005000181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 40005000181 its reverse (18100050004), we get a palindrome (58105050185).

The spelling of 40005000181 in words is "forty billion, five million, one hundred eighty-one", and thus it is an aban number.