165688563 has 8 divisors (see below), whose sum is σ = 221278608. Its totient is φ = 110278784.

The previous prime is 165688561. The next prime is 165688577. The reversal of 165688563 is 365886561.

165688563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165688563 - 2¹ = 165688561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165688561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42906 + ... + 46607.

It is an arithmetic number, because the mean of its divisors is an integer number (27659826).

Almost surely, 2^165688563 is an apocalyptic number.

165688563 is a deficient number, since it is larger than the sum of its proper divisors (55590045).

165688563 is an equidigital number, since it uses as much as digits as its factorization.

165688563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90133.

The product of its digits is 1036800, while the sum is 48.

The square root of 165688563 is about 12872.0069530746. The cubic root of 165688563 is about 549.2425529329.

The spelling of 165688563 in words is "one hundred sixty-five million, six hundred eighty-eight thousand, five hundred sixty-three".