643325001 has 16 divisors (see below), whose sum is σ = 936785088. Its totient is φ = 389460800.

The previous prime is 643324993. The next prime is 643325057. The reversal of 643325001 is 100523346.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 643325001 - 2³ = 643324993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643325701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20695 + ... + 41411.

It is an arithmetic number, because the mean of its divisors is an integer number (58549068).

Almost surely, 2^643325001 is an apocalyptic number.

It is an amenable number.

643325001 is a deficient number, since it is larger than the sum of its proper divisors (293460087).

643325001 is a wasteful number, since it uses less digits than its factorization.

643325001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21672.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 643325001 is about 25363.8522507919. The cubic root of 643325001 is about 863.2636942714.

Adding to 643325001 its reverse (100523346), we get a palindrome (743848347).

The spelling of 643325001 in words is "six hundred forty-three million, three hundred twenty-five thousand, one".