165934580011 has 4 divisors (see below), whose sum is σ = 173149126992. Its totient is φ = 158720033032.

The previous prime is 165934579991. The next prime is 165934580051. The reversal of 165934580011 is 110085439561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110085439561 = 41 ⋅2685010721.

It is a cyclic number.

It is not a de Polignac number, because 165934580011 - 2⁷ = 165934579883 is a prime.

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 165934580011.

It is not an unprimeable number, because it can be changed into a prime (165934580051) 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, 3607273456 + ... + 3607273501.

It is an arithmetic number, because the mean of its divisors is an integer number (43287281748).

Almost surely, 2^165934580011 is an apocalyptic number.

165934580011 is a deficient number, since it is larger than the sum of its proper divisors (7214546981).

165934580011 is an equidigital number, since it uses as much as digits as its factorization.

165934580011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7214546980.

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 165934580011 in words is "one hundred sixty-five billion, nine hundred thirty-four million, five hundred eighty thousand, eleven".