243663065 has 4 divisors (see below), whose sum is σ = 292395684. Its totient is φ = 194930448.

The previous prime is 243663059. The next prime is 243663071. The reversal of 243663065 is 560366342.

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

It is an interprime number because it is at equal distance from previous prime (243663059) and next prime (243663071).

It can be written as a sum of positive squares in 2 ways, for example, as 179854921 + 63808144 = 13411^2 + 7988^2 .

It is a cyclic number.

It is not a de Polignac number, because 243663065 - 2²⁴ = 226885849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24366302 + ... + 24366311.

It is an arithmetic number, because the mean of its divisors is an integer number (73098921).

Almost surely, 2^243663065 is an apocalyptic number.

It is an amenable number.

243663065 is a deficient number, since it is larger than the sum of its proper divisors (48732619).

243663065 is an equidigital number, since it uses as much as digits as its factorization.

243663065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48732618.

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 243663065 is about 15609.7105994954. The cubic root of 243663065 is about 624.5922161309.

The spelling of 243663065 in words is "two hundred forty-three million, six hundred sixty-three thousand, sixty-five".