40165738165861 has 32 divisors (see below), whose sum is σ = 51211281888000. Its totient is φ = 30593294983680.

The previous prime is 40165738165843. The next prime is 40165738165873. The reversal of 40165738165861 is 16856183756104.

It is not a de Polignac number, because 40165738165861 - 2¹¹ = 40165738163813 is a prime.

It is a super-2 number, since 2×40165738165861² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40165738165861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40165738165801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17196136 + ... + 19391713.

It is an arithmetic number, because the mean of its divisors is an integer number (1600352559000).

Almost surely, 2^{40165738165861} is an apocalyptic number.

It is an amenable number.

40165738165861 is a deficient number, since it is larger than the sum of its proper divisors (11045543722139).

40165738165861 is a wasteful number, since it uses less digits than its factorization.

40165738165861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36588189.

The product of its (nonzero) digits is 29030400, while the sum is 61.

The spelling of 40165738165861 in words is "forty trillion, one hundred sixty-five billion, seven hundred thirty-eight million, one hundred sixty-five thousand, eight hundred sixty-one".