40165640161 has 4 divisors (see below), whose sum is σ = 40167936432. Its totient is φ = 40163343892.

The previous prime is 40165640063. The next prime is 40165640173. The reversal of 40165640161 is 16104656104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40165640161 - 2¹¹ = 40165638113 is a prime.

It is a super-2 number, since 2×40165640161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40165340161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121695 + ... + 1156948.

It is an arithmetic number, because the mean of its divisors is an integer number (10041984108).

Almost surely, 2^40165640161 is an apocalyptic number.

It is an amenable number.

40165640161 is a deficient number, since it is larger than the sum of its proper divisors (2296271).

40165640161 is a wasteful number, since it uses less digits than its factorization.

40165640161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296270.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 40165640161 in words is "forty billion, one hundred sixty-five million, six hundred forty thousand, one hundred sixty-one".