165646563 has 16 divisors (see below), whose sum is σ = 225562656. Its totient is φ = 108103680.

The previous prime is 165646531. The next prime is 165646573. The reversal of 165646563 is 365646561.

It is not a de Polignac number, because 165646563 - 2⁵ = 165646531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165646573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27243 + ... + 32763.

It is an arithmetic number, because the mean of its divisors is an integer number (14097666).

Almost surely, 2^165646563 is an apocalyptic number.

165646563 is a deficient number, since it is larger than the sum of its proper divisors (59916093).

165646563 is a wasteful number, since it uses less digits than its factorization.

165646563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5734.

The product of its digits is 388800, while the sum is 42.

The square root of 165646563 is about 12870.3754024504. The cubic root of 165646563 is about 549.1961402812.

The spelling of 165646563 in words is "one hundred sixty-five million, six hundred forty-six thousand, five hundred sixty-three".