245821620017 has 2 divisors, whose sum is σ = 245821620018. Its totient is φ = 245821620016.

The previous prime is 245821619999. The next prime is 245821620059. The reversal of 245821620017 is 710026128542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199062314896 + 46759305121 = 446164^2 + 216239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245821620017 is a prime.

It is not a weakly prime, because it can be changed into another prime (245821620097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122910810008 + 122910810009.

It is an arithmetic number, because the mean of its divisors is an integer number (122910810009).

Almost surely, 2^245821620017 is an apocalyptic number.

It is an amenable number.

245821620017 is a deficient number, since it is larger than the sum of its proper divisors (1).

245821620017 is an equidigital number, since it uses as much as digits as its factorization.

245821620017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 38.

Adding to 245821620017 its reverse (710026128542), we get a palindrome (955847748559).

The spelling of 245821620017 in words is "two hundred forty-five billion, eight hundred twenty-one million, six hundred twenty thousand, seventeen".