243203355011 has 4 divisors (see below), whose sum is σ = 248859247032. Its totient is φ = 237547462992.

The previous prime is 243203354987. The next prime is 243203355047. The reversal of 243203355011 is 110553302342.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 243203355011 - 2²⁶ = 243136246147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243203355061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2827945946 + ... + 2827946031.

It is an arithmetic number, because the mean of its divisors is an integer number (62214811758).

Almost surely, 2^243203355011 is an apocalyptic number.

243203355011 is a deficient number, since it is larger than the sum of its proper divisors (5655892021).

243203355011 is an equidigital number, since it uses as much as digits as its factorization.

243203355011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655892020.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 243203355011 its reverse (110553302342), we get a palindrome (353756657353).

The spelling of 243203355011 in words is "two hundred forty-three billion, two hundred three million, three hundred fifty-five thousand, eleven".