645204474453 has 128 divisors (see below), whose sum is σ = 1149886955520. Its totient is φ = 312035328000.

The previous prime is 645204474371. The next prime is 645204474469. The reversal of 645204474453 is 354474402546.

It is not a de Polignac number, because 645204474453 - 2²¹ = 645202377301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645204474493) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23567493 + ... + 23594853.

It is an arithmetic number, because the mean of its divisors is an integer number (8983491840).

Almost surely, 2^645204474453 is an apocalyptic number.

It is an amenable number.

645204474453 is a deficient number, since it is larger than the sum of its proper divisors (504682481067).

645204474453 is a wasteful number, since it uses less digits than its factorization.

645204474453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27539.

The product of its (nonzero) digits is 6451200, while the sum is 48.

Adding to 645204474453 its reverse (354474402546), we get a palindrome (999678876999).

The spelling of 645204474453 in words is "six hundred forty-five billion, two hundred four million, four hundred seventy-four thousand, four hundred fifty-three".