645332004321 has 16 divisors (see below), whose sum is σ = 861311683584. Its totient is φ = 429786970704.

The previous prime is 645332004281. The next prime is 645332004341. The reversal of 645332004321 is 123400233546.

It is a happy number.

It is not a de Polignac number, because 645332004321 - 2¹⁰ = 645332003297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (645332004341) 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, 23566980 + ... + 23594346.

It is an arithmetic number, because the mean of its divisors is an integer number (53831980224).

Almost surely, 2^645332004321 is an apocalyptic number.

It is an amenable number.

645332004321 is a deficient number, since it is larger than the sum of its proper divisors (215979679263).

645332004321 is a wasteful number, since it uses less digits than its factorization.

645332004321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35020.

The product of its (nonzero) digits is 51840, while the sum is 33.

Adding to 645332004321 its reverse (123400233546), we get a palindrome (768732237867).

The spelling of 645332004321 in words is "six hundred forty-five billion, three hundred thirty-two million, four thousand, three hundred twenty-one".