645204353 has 8 divisors (see below), whose sum is σ = 659482560. Its totient is φ = 631037680.

The previous prime is 645204341. The next prime is 645204359. The reversal of 645204353 is 353402546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645204353 - 2⁶ = 645204289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645204359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16133 + ... + 39378.

It is an arithmetic number, because the mean of its divisors is an integer number (82435320).

Almost surely, 2^645204353 is an apocalyptic number.

It is an amenable number.

645204353 is a deficient number, since it is larger than the sum of its proper divisors (14278207).

645204353 is a wasteful number, since it uses less digits than its factorization.

645204353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55767.

The product of its (nonzero) digits is 43200, while the sum is 32.

The square root of 645204353 is about 25400.8730755460. The cubic root of 645204353 is about 864.1034974218.

Adding to 645204353 its reverse (353402546), we get a palindrome (998606899).

The spelling of 645204353 in words is "six hundred forty-five million, two hundred four thousand, three hundred fifty-three".