245235305257 has 2 divisors, whose sum is σ = 245235305258. Its totient is φ = 245235305256.

The previous prime is 245235305191. The next prime is 245235305303. The reversal of 245235305257 is 752503532542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199506048921 + 45729256336 = 446661^2 + 213844^2 .

It is a cyclic number.

It is not a de Polignac number, because 245235305257 - 2⁷ = 245235305129 is a prime.

It is not a weakly prime, because it can be changed into another prime (245235305657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122617652628 + 122617652629.

It is an arithmetic number, because the mean of its divisors is an integer number (122617652629).

Almost surely, 2^245235305257 is an apocalyptic number.

It is an amenable number.

245235305257 is a deficient number, since it is larger than the sum of its proper divisors (1).

245235305257 is an equidigital number, since it uses as much as digits as its factorization.

245235305257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260000, while the sum is 43.

Adding to 245235305257 its reverse (752503532542), we get a palindrome (997738837799).

The spelling of 245235305257 in words is "two hundred forty-five billion, two hundred thirty-five million, three hundred five thousand, two hundred fifty-seven".