165555227 has 4 divisors (see below), whose sum is σ = 174268680. Its totient is φ = 156841776.

The previous prime is 165555211. The next prime is 165555263. The reversal of 165555227 is 722555561.

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 165555227 - 2⁴ = 165555211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165552227) 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, 4356698 + ... + 4356735.

It is an arithmetic number, because the mean of its divisors is an integer number (43567170).

Almost surely, 2^165555227 is an apocalyptic number.

165555227 is a deficient number, since it is larger than the sum of its proper divisors (8713453).

165555227 is an equidigital number, since it uses as much as digits as its factorization.

165555227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8713452.

The product of its digits is 105000, while the sum is 38.

The square root of 165555227 is about 12866.8266095413. The cubic root of 165555227 is about 549.0951811465.

The spelling of 165555227 in words is "one hundred sixty-five million, five hundred fifty-five thousand, two hundred twenty-seven".