165563365 has 32 divisors (see below), whose sum is σ = 222082560. Its totient is φ = 117480000.

The previous prime is 165563351. The next prime is 165563369. The reversal of 165563365 is 563365561.

It is not a de Polignac number, because 165563365 - 2⁹ = 165562853 is a prime.

It is a super-2 number, since 2×165563365² = 54822455660246450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165563369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 659490 + ... + 659740.

It is an arithmetic number, because the mean of its divisors is an integer number (6940080).

Almost surely, 2^165563365 is an apocalyptic number.

It is an amenable number.

165563365 is a deficient number, since it is larger than the sum of its proper divisors (56519195).

165563365 is a wasteful number, since it uses less digits than its factorization.

165563365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513.

The product of its digits is 243000, while the sum is 40.

The square root of 165563365 is about 12867.1428452473. The cubic root of 165563365 is about 549.1041780705.

The spelling of 165563365 in words is "one hundred sixty-five million, five hundred sixty-three thousand, three hundred sixty-five".