645317235453 has 48 divisors (see below), whose sum is σ = 961648520000. Its totient is φ = 384533740800.

The previous prime is 645317235419. The next prime is 645317235463. The reversal of 645317235453 is 354532713546.

It is not a de Polignac number, because 645317235453 - 2⁹ = 645317234941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645317235463) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77474193 + ... + 77482521.

Almost surely, 2^645317235453 is an apocalyptic number.

It is an amenable number.

645317235453 is a deficient number, since it is larger than the sum of its proper divisors (316331284547).

645317235453 is a wasteful number, since it uses less digits than its factorization.

645317235453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11914 (or 11903 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 48.

Adding to 645317235453 its reverse (354532713546), we get a palindrome (999849948999).

The spelling of 645317235453 in words is "six hundred forty-five billion, three hundred seventeen million, two hundred thirty-five thousand, four hundred fifty-three".