243775236361 has 4 divisors (see below), whose sum is σ = 243840056724. Its totient is φ = 243710416000.

The previous prime is 243775236347. The next prime is 243775236427. The reversal of 243775236361 is 163632577342.

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 133239600400 + 110535635961 = 365020^2 + 332469^2 .

It is a cyclic number.

It is not a de Polignac number, because 243775236361 - 2²⁵ = 243741681929 is a prime.

It is a super-2 number, since 2×243775236361² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) 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 (243775236961) 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, 32404540 + ... + 32412061.

It is an arithmetic number, because the mean of its divisors is an integer number (60960014181).

Almost surely, 2^243775236361 is an apocalyptic number.

It is an amenable number.

243775236361 is a deficient number, since it is larger than the sum of its proper divisors (64820363).

243775236361 is an equidigital number, since it uses as much as digits as its factorization.

243775236361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64820362.

The product of its digits is 3810240, while the sum is 49.

The spelling of 243775236361 in words is "two hundred forty-three billion, seven hundred seventy-five million, two hundred thirty-six thousand, three hundred sixty-one".