4398335566561 has 4 divisors (see below), whose sum is σ = 4398418796800. Its totient is φ = 4398252336324.

The previous prime is 4398335566549. The next prime is 4398335566577. The reversal of 4398335566561 is 1656655338934.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4398335566561 - 2¹³ = 4398335558369 is a prime.

It is a super-2 number, since 2×4398335566561² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4398335566493 and 4398335566502.

It is not an unprimeable number, because it can be changed into a prime (4398335566501) 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, 41535801 + ... + 41641558.

It is an arithmetic number, because the mean of its divisors is an integer number (1099604699200).

Almost surely, 2^{4398335566561} is an apocalyptic number.

It is an amenable number.

4398335566561 is a deficient number, since it is larger than the sum of its proper divisors (83230239).

4398335566561 is an equidigital number, since it uses as much as digits as its factorization.

4398335566561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83230238.

The product of its digits is 209952000, while the sum is 64.

The spelling of 4398335566561 in words is "four trillion, three hundred ninety-eight billion, three hundred thirty-five million, five hundred sixty-six thousand, five hundred sixty-one".