243917442805 has 4 divisors (see below), whose sum is σ = 292700931372. Its totient is φ = 195133954240.

The previous prime is 243917442763. The next prime is 243917442823. The reversal of 243917442805 is 508244719342.

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 60288909444 + 183628533361 = 245538^2 + 428519^2 .

It is not a de Polignac number, because 243917442805 - 2²⁵ = 243883888373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24391744276 + ... + 24391744285.

It is an arithmetic number, because the mean of its divisors is an integer number (73175232843).

Almost surely, 2^243917442805 is an apocalyptic number.

It is an amenable number.

243917442805 is a deficient number, since it is larger than the sum of its proper divisors (48783488567).

243917442805 is an equidigital number, since it uses as much as digits as its factorization.

243917442805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48783488566.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 243917442805 in words is "two hundred forty-three billion, nine hundred seventeen million, four hundred forty-two thousand, eight hundred five".