163243665 has 48 divisors (see below), whose sum is σ = 306672912. Its totient is φ = 79852032.

The previous prime is 163243651. The next prime is 163243681. The reversal of 163243665 is 566342361.

163243665 is a `hidden beast` number, since 163 + 2 + 436 + 65 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 221841 + 163021824 = 471^2 + 12768^2 .

It is not a de Polignac number, because 163243665 - 2⁶ = 163243601 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100399 + ... + 102011.

It is an arithmetic number, because the mean of its divisors is an integer number (6389019).

Almost surely, 2^163243665 is an apocalyptic number.

163243665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163243665 is a deficient number, since it is larger than the sum of its proper divisors (143429247).

163243665 is a wasteful number, since it uses less digits than its factorization.

163243665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810 (or 1807 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 163243665 is about 12776.6844290684. The cubic root of 163243665 is about 546.5276166188.

The spelling of 163243665 in words is "one hundred sixty-three million, two hundred forty-three thousand, six hundred sixty-five".