165405560550211 has 4 divisors (see below), whose sum is σ = 165575906133624. Its totient is φ = 165235214966800.

The previous prime is 165405560550163. The next prime is 165405560550271. The reversal of 165405560550211 is 112055065504561.

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 165405560550211 - 2¹⁵ = 165405560517443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165405560550271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85172790250 + ... + 85172792191.

It is an arithmetic number, because the mean of its divisors is an integer number (41393976533406).

Almost surely, 2^{165405560550211} is an apocalyptic number.

165405560550211 is a deficient number, since it is larger than the sum of its proper divisors (170345583413).

165405560550211 is an equidigital number, since it uses as much as digits as its factorization.

165405560550211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170345583412.

The product of its (nonzero) digits is 900000, while the sum is 46.

The spelling of 165405560550211 in words is "one hundred sixty-five trillion, four hundred five billion, five hundred sixty million, five hundred fifty thousand, two hundred eleven".