165666229 has 4 divisors (see below), whose sum is σ = 169518976. Its totient is φ = 161813484.

The previous prime is 165666227. The next prime is 165666247. The reversal of 165666229 is 922666561.

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 165666229 - 2¹ = 165666227 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 3852703 = 165666229 / (1 + 6 + 5 + 6 + 6 + 6 + 2 + 2 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165666227) 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, 1926309 + ... + 1926394.

It is an arithmetic number, because the mean of its divisors is an integer number (42379744).

Almost surely, 2^165666229 is an apocalyptic number.

It is an amenable number.

165666229 is a deficient number, since it is larger than the sum of its proper divisors (3852747).

165666229 is an equidigital number, since it uses as much as digits as its factorization.

165666229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3852746.

The product of its digits is 233280, while the sum is 43.

The square root of 165666229 is about 12871.1393823546. The cubic root of 165666229 is about 549.2178734294.

The spelling of 165666229 in words is "one hundred sixty-five million, six hundred sixty-six thousand, two hundred twenty-nine".