645335453 has 16 divisors (see below), whose sum is σ = 782478720. Its totient is φ = 519561216.

The previous prime is 645335447. The next prime is 645335459. The reversal of 645335453 is 354533546.

It is an interprime number because it is at equal distance from previous prime (645335447) and next prime (645335459).

It is a cyclic number.

It is not a de Polignac number, because 645335453 - 2¹⁸ = 645073309 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645335459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57053 + ... + 67421.

It is an arithmetic number, because the mean of its divisors is an integer number (48904920).

Almost surely, 2^645335453 is an apocalyptic number.

It is an amenable number.

645335453 is a deficient number, since it is larger than the sum of its proper divisors (137143267).

645335453 is a wasteful number, since it uses less digits than its factorization.

645335453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10916.

The product of its digits is 324000, while the sum is 38.

The square root of 645335453 is about 25403.4535644270. The cubic root of 645335453 is about 864.1620196022.

Adding to 645335453 its reverse (354533546), we get a palindrome (999868999).

The spelling of 645335453 in words is "six hundred forty-five million, three hundred thirty-five thousand, four hundred fifty-three".