6640501 has 8 divisors (see below), whose sum is σ = 7794560. Its totient is φ = 5537808.

The previous prime is 6640499. The next prime is 6640511. The reversal of 6640501 is 1050466.

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 6640501 - 2¹ = 6640499 is a prime.

It is a Duffinian number.

6640501 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640511) 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 7 ways as a sum of consecutive naturals, for example, 12561 + ... + 13078.

It is an arithmetic number, because the mean of its divisors is an integer number (974320).

Almost surely, 2^6640501 is an apocalyptic number.

It is an amenable number.

6640501 is a deficient number, since it is larger than the sum of its proper divisors (1154059).

6640501 is a wasteful number, since it uses less digits than its factorization.

6640501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25683.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 6640501 is about 2576.9169563647. The cubic root of 6640501 is about 187.9606545850.

Adding to 6640501 its reverse (1050466), we get a palindrome (7690967).

The spelling of 6640501 in words is "six million, six hundred forty thousand, five hundred one".