243664011 has 8 divisors (see below), whose sum is σ = 360983760. Its totient is φ = 162442656.

The previous prime is 243664007. The next prime is 243664033. The reversal of 243664011 is 110466342.

243664011 is a `hidden beast` number, since 2 + 4 + 3 + 6 + 640 + 11 = 666.

It is not a de Polignac number, because 243664011 - 2² = 243664007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9024593 = 243664011 / (2 + 4 + 3 + 6 + 6 + 4 + 0 + 1 + 1).

It is not an unprimeable number, because it can be changed into a prime (243665011) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4512270 + ... + 4512323.

It is an arithmetic number, because the mean of its divisors is an integer number (45122970).

Almost surely, 2^243664011 is an apocalyptic number.

243664011 is a deficient number, since it is larger than the sum of its proper divisors (117319749).

243664011 is an equidigital number, since it uses as much as digits as its factorization.

243664011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9024602 (or 9024596 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 243664011 is about 15609.7409011168. The cubic root of 243664011 is about 624.5930244376.

The spelling of 243664011 in words is "two hundred forty-three million, six hundred sixty-four thousand, eleven".