165565247 has 6 divisors (see below), whose sum is σ = 172828152. Its totient is φ = 158307732.

The previous prime is 165565237. The next prime is 165565289. The reversal of 165565247 is 742565561.

It is not a de Polignac number, because 165565247 - 2²² = 161370943 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 (165565237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60368 + ... + 63050.

It is an arithmetic number, because the mean of its divisors is an integer number (28804692).

Almost surely, 2^165565247 is an apocalyptic number.

165565247 is a deficient number, since it is larger than the sum of its proper divisors (7262905).

165565247 is an frugal number, since it uses more digits than its factorization.

165565247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5389 (or 2706 counting only the distinct ones).

The product of its digits is 252000, while the sum is 41.

The square root of 165565247 is about 12867.2159770480. The cubic root of 165565247 is about 549.1062586639.

The spelling of 165565247 in words is "one hundred sixty-five million, five hundred sixty-five thousand, two hundred forty-seven".