40161108543509 has 2 divisors, whose sum is σ = 40161108543510. Its totient is φ = 40161108543508.

The previous prime is 40161108543481. The next prime is 40161108543601. The reversal of 40161108543509 is 90534580116104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35600876422609 + 4560232120900 = 5966647^2 + 2135470^2 .

It is a cyclic number.

It is not a de Polignac number, because 40161108543509 - 2²⁰ = 40161107494933 is a prime.

It is a super-2 number, since 2×40161108543509² (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 (40161108546509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20080554271754 + 20080554271755.

It is an arithmetic number, because the mean of its divisors is an integer number (20080554271755).

Almost surely, 2^{40161108543509} is an apocalyptic number.

It is an amenable number.

40161108543509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40161108543509 is an equidigital number, since it uses as much as digits as its factorization.

40161108543509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 40161108543509 in words is "forty trillion, one hundred sixty-one billion, one hundred eight million, five hundred forty-three thousand, five hundred nine".