4243557566399 has 4 divisors (see below), whose sum is σ = 4244167367520. Its totient is φ = 4242947765280.

The previous prime is 4243557566363. The next prime is 4243557566407. The reversal of 4243557566399 is 9936657553424.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4243557566399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243557566359) 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, 304890122 + ... + 304904039.

It is an arithmetic number, because the mean of its divisors is an integer number (1061041841880).

Almost surely, 2^{4243557566399} is an apocalyptic number.

4243557566399 is a deficient number, since it is larger than the sum of its proper divisors (609801121).

4243557566399 is an equidigital number, since it uses as much as digits as its factorization.

4243557566399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609801120.

The product of its digits is 734832000, while the sum is 68.

The spelling of 4243557566399 in words is "four trillion, two hundred forty-three billion, five hundred fifty-seven million, five hundred sixty-six thousand, three hundred ninety-nine".