40160636465581 has 2 divisors, whose sum is σ = 40160636465582. Its totient is φ = 40160636465580.

The previous prime is 40160636465557. The next prime is 40160636465641. The reversal of 40160636465581 is 18556463606104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22594764026025 + 17565872439556 = 4753395^2 + 4191166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40160636465581 is a prime.

It is a super-2 number, since 2×40160636465581² (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 (40160636465501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20080318232790 + 20080318232791.

It is an arithmetic number, because the mean of its divisors is an integer number (20080318232791).

Almost surely, 2^{40160636465581} is an apocalyptic number.

It is an amenable number.

40160636465581 is a deficient number, since it is larger than the sum of its proper divisors (1).

40160636465581 is an equidigital number, since it uses as much as digits as its factorization.

40160636465581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 40160636465581 in words is "forty trillion, one hundred sixty billion, six hundred thirty-six million, four hundred sixty-five thousand, five hundred eighty-one".