6640201 has 4 divisors (see below), whose sum is σ = 6714900. Its totient is φ = 6565504.

The previous prime is 6640181. The next prime is 6640213. The reversal of 6640201 is 1020466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1020466 = 2 ⋅510233.

It can be written as a sum of positive squares in 2 ways, for example, as 4206601 + 2433600 = 2051^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640201 - 2¹¹ = 6638153 is a prime.

It is a Duffinian number.

6640201 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6640241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37216 + ... + 37393.

It is an arithmetic number, because the mean of its divisors is an integer number (1678725).

Almost surely, 2^6640201 is an apocalyptic number.

It is an amenable number.

6640201 is a deficient number, since it is larger than the sum of its proper divisors (74699).

6640201 is an equidigital number, since it uses as much as digits as its factorization.

6640201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74698.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 6640201 is about 2576.8587466138. The cubic root of 6640201 is about 187.9578240232.

Adding to 6640201 its reverse (1020466), we get a palindrome (7660667).

The spelling of 6640201 in words is "six million, six hundred forty thousand, two hundred one".