165564269 has 4 divisors (see below), whose sum is σ = 178299996. Its totient is φ = 152828544.

The previous prime is 165564263. The next prime is 165564299. The reversal of 165564269 is 962465561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21252100 + 144312169 = 4610^2 + 12013^2 .

It is a cyclic number.

It is not a de Polignac number, because 165564269 - 2⁴ = 165564253 is a prime.

It is a super-2 number, since 2×165564269² = 54823054339008722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165564263) 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, 6367844 + ... + 6367869.

It is an arithmetic number, because the mean of its divisors is an integer number (44574999).

Almost surely, 2^165564269 is an apocalyptic number.

It is an amenable number.

165564269 is a deficient number, since it is larger than the sum of its proper divisors (12735727).

165564269 is a wasteful number, since it uses less digits than its factorization.

165564269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12735726.

The product of its digits is 388800, while the sum is 44.

The square root of 165564269 is about 12867.1779734330. The cubic root of 165564269 is about 549.1051774648.

The spelling of 165564269 in words is "one hundred sixty-five million, five hundred sixty-four thousand, two hundred sixty-nine".