245666443 has 4 divisors (see below), whose sum is σ = 267999768. Its totient is φ = 223333120.

The previous prime is 245666431. The next prime is 245666503. The reversal of 245666443 is 344666542.

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-245666443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 245666396 and 245666405.

It is not an unprimeable number, because it can be changed into a prime (245664443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11166646 + ... + 11166667.

It is an arithmetic number, because the mean of its divisors is an integer number (66999942).

Almost surely, 2^245666443 is an apocalyptic number.

245666443 is a deficient number, since it is larger than the sum of its proper divisors (22333325).

245666443 is a wasteful number, since it uses less digits than its factorization.

245666443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22333324.

The product of its digits is 414720, while the sum is 40.

The square root of 245666443 is about 15673.7501256081. The cubic root of 245666443 is about 626.2993282818.

Subtracting 245666443 from its reverse (344666542), we obtain a palindrome (99000099).

The spelling of 245666443 in words is "two hundred forty-five million, six hundred sixty-six thousand, four hundred forty-three".