640325001 has 4 divisors (see below), whose sum is σ = 853766672. Its totient is φ = 426883332.

The previous prime is 640324981. The next prime is 640325029. The reversal of 640325001 is 100523046.

It is a happy number.

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 not a de Polignac number, because 640325001 - 2¹⁰ = 640323977 is a prime.

It is a super-2 number, since 2×640325001² = 820032213811300002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640325201) 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 3 ways as a sum of consecutive naturals, for example, 106720831 + ... + 106720836.

It is an arithmetic number, because the mean of its divisors is an integer number (213441668).

Almost surely, 2^640325001 is an apocalyptic number.

It is an amenable number.

640325001 is a deficient number, since it is larger than the sum of its proper divisors (213441671).

640325001 is a wasteful number, since it uses less digits than its factorization.

640325001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213441670.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 640325001 is about 25304.6438623427. The cubic root of 640325001 is about 861.9197249585.

Adding to 640325001 its reverse (100523046), we get a palindrome (740848047).

The spelling of 640325001 in words is "six hundred forty million, three hundred twenty-five thousand, one".