165366563 has 4 divisors (see below), whose sum is σ = 165931248. Its totient is φ = 164801880.

The previous prime is 165366559. The next prime is 165366569. The reversal of 165366563 is 365663561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365663561 = 71 ⋅5150191.

It is a cyclic number.

It is not a de Polignac number, because 165366563 - 2² = 165366559 is a prime.

It is a super-2 number, since 2×165366563² = 54692200316865938, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165366563.

It is not an unprimeable number, because it can be changed into a prime (165366569) 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, 281903 + ... + 282488.

It is an arithmetic number, because the mean of its divisors is an integer number (41482812).

Almost surely, 2^165366563 is an apocalyptic number.

165366563 is a deficient number, since it is larger than the sum of its proper divisors (564685).

165366563 is an equidigital number, since it uses as much as digits as its factorization.

165366563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564684.

The product of its digits is 291600, while the sum is 41.

The square root of 165366563 is about 12859.4931082061. The cubic root of 165366563 is about 548.8865219343.

The spelling of 165366563 in words is "one hundred sixty-five million, three hundred sixty-six thousand, five hundred sixty-three".