165605655661111 has 4 divisors (see below), whose sum is σ = 165606122257632. Its totient is φ = 165605189064592.

The previous prime is 165605655661063. The next prime is 165605655661133. The reversal of 165605655661111 is 111166556506561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165605655661111 - 2⁷ = 165605655660983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165605655671111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232765471 + ... + 233475856.

It is an arithmetic number, because the mean of its divisors is an integer number (41401530564408).

Almost surely, 2^{165605655661111} is an apocalyptic number.

165605655661111 is a deficient number, since it is larger than the sum of its proper divisors (466596521).

165605655661111 is an equidigital number, since it uses as much as digits as its factorization.

165605655661111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466596520.

The product of its (nonzero) digits is 4860000, while the sum is 55.

The spelling of 165605655661111 in words is "one hundred sixty-five trillion, six hundred five billion, six hundred fifty-five million, six hundred sixty-one thousand, one hundred eleven".