4243242565 has 4 divisors (see below), whose sum is σ = 5091891084. Its totient is φ = 3394594048.

The previous prime is 4243242541. The next prime is 4243242629. The reversal of 4243242565 is 5652423424.

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 1583880804 + 2659361761 = 39798^2 + 51569^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243242565 - 2¹¹ = 4243240517 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, 424324252 + ... + 424324261.

It is an arithmetic number, because the mean of its divisors is an integer number (1272972771).

Almost surely, 2^4243242565 is an apocalyptic number.

It is an amenable number.

4243242565 is a deficient number, since it is larger than the sum of its proper divisors (848648519).

4243242565 is an equidigital number, since it uses as much as digits as its factorization.

4243242565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848648518.

The product of its digits is 230400, while the sum is 37.

The square root of 4243242565 is about 65140.1762739402. The cubic root of 4243242565 is about 1618.9469563722.

Adding to 4243242565 its reverse (5652423424), we get a palindrome (9895665989).

The spelling of 4243242565 in words is "four billion, two hundred forty-three million, two hundred forty-two thousand, five hundred sixty-five".