645203634001 has 4 divisors (see below), whose sum is σ = 645591611392. Its totient is φ = 644815656612.

The previous prime is 645203633993. The next prime is 645203634067. The reversal of 645203634001 is 100436302546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645203634001 - 2³ = 645203633993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645203674001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193986201 + ... + 193989526.

It is an arithmetic number, because the mean of its divisors is an integer number (161397902848).

Almost surely, 2^645203634001 is an apocalyptic number.

It is an amenable number.

645203634001 is a deficient number, since it is larger than the sum of its proper divisors (387977391).

645203634001 is a wasteful number, since it uses less digits than its factorization.

645203634001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387977390.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 645203634001 its reverse (100436302546), we get a palindrome (745639936547).

The spelling of 645203634001 in words is "six hundred forty-five billion, two hundred three million, six hundred thirty-four thousand, one".