645246206453 has 2 divisors, whose sum is σ = 645246206454. Its totient is φ = 645246206452.

The previous prime is 645246206399. The next prime is 645246206461. The reversal of 645246206453 is 354602642546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504019063249 + 141227143204 = 709943^2 + 375802^2 .

It is a cyclic number.

It is not a de Polignac number, because 645246206453 - 2¹² = 645246202357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645246206398 and 645246206407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645246706453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322623103226 + 322623103227.

It is an arithmetic number, because the mean of its divisors is an integer number (322623103227).

Almost surely, 2^645246206453 is an apocalyptic number.

It is an amenable number.

645246206453 is a deficient number, since it is larger than the sum of its proper divisors (1).

645246206453 is an equidigital number, since it uses as much as digits as its factorization.

645246206453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4147200, while the sum is 47.

Adding to 645246206453 its reverse (354602642546), we get a palindrome (999848848999).

The spelling of 645246206453 in words is "six hundred forty-five billion, two hundred forty-six million, two hundred six thousand, four hundred fifty-three".