165670563 has 16 divisors (see below), whose sum is σ = 224048160. Its totient is φ = 108877824.

The previous prime is 165670537. The next prime is 165670577. The reversal of 165670563 is 365076561.

It is not a de Polignac number, because 165670563 - 2¹² = 165666467 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (165670363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114895 + ... + 116327.

It is an arithmetic number, because the mean of its divisors is an integer number (14003010).

Almost surely, 2^165670563 is an apocalyptic number.

165670563 is a deficient number, since it is larger than the sum of its proper divisors (58377597).

165670563 is a wasteful number, since it uses less digits than its factorization.

165670563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 165670563 is about 12871.3077424169. The cubic root of 165670563 is about 549.2226627570. Note that the first 3 decimals are identical.

The spelling of 165670563 in words is "one hundred sixty-five million, six hundred seventy thousand, five hundred sixty-three".