645245335313 has 2 divisors, whose sum is σ = 645245335314. Its totient is φ = 645245335312.

The previous prime is 645245335279. The next prime is 645245335373. The reversal of 645245335313 is 313533542546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 563622559504 + 81622775809 = 750748^2 + 285697^2 .

It is a cyclic number.

It is not a de Polignac number, because 645245335313 - 2³⁴ = 628065466129 is a prime.

It is not a weakly prime, because it can be changed into another prime (645245335373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322622667656 + 322622667657.

It is an arithmetic number, because the mean of its divisors is an integer number (322622667657).

Almost surely, 2^645245335313 is an apocalyptic number.

It is an amenable number.

645245335313 is a deficient number, since it is larger than the sum of its proper divisors (1).

645245335313 is an equidigital number, since it uses as much as digits as its factorization.

645245335313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944000, while the sum is 44.

Adding to 645245335313 its reverse (313533542546), we get a palindrome (958778877859).

The spelling of 645245335313 in words is "six hundred forty-five billion, two hundred forty-five million, three hundred thirty-five thousand, three hundred thirteen".