163040665 has 4 divisors (see below), whose sum is σ = 195648804. Its totient is φ = 130432528.

The previous prime is 163040663. The next prime is 163040699. The reversal of 163040665 is 566040361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115541001 + 47499664 = 10749^2 + 6892^2 .

It is a cyclic number.

It is not a de Polignac number, because 163040665 - 2¹ = 163040663 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163040663) 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 3 ways as a sum of consecutive naturals, for example, 16304062 + ... + 16304071.

It is an arithmetic number, because the mean of its divisors is an integer number (48912201).

Almost surely, 2^163040665 is an apocalyptic number.

It is an amenable number.

163040665 is a deficient number, since it is larger than the sum of its proper divisors (32608139).

163040665 is an equidigital number, since it uses as much as digits as its factorization.

163040665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32608138.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 163040665 is about 12768.7377997984. The cubic root of 163040665 is about 546.3009796951.

The spelling of 163040665 in words is "one hundred sixty-three million, forty thousand, six hundred sixty-five".