6640801 has 4 divisors (see below), whose sum is σ = 6689412. Its totient is φ = 6592192.

The previous prime is 6640793. The next prime is 6640807. The reversal of 6640801 is 1080466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1080466 = 2 ⋅540233.

It can be written as a sum of positive squares in 2 ways, for example, as 1442401 + 5198400 = 1201^2 + 2280^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640801 - 2³ = 6640793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640807) 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, 24100 + ... + 24373.

It is an arithmetic number, because the mean of its divisors is an integer number (1672353).

Almost surely, 2^6640801 is an apocalyptic number.

It is an amenable number.

6640801 is a deficient number, since it is larger than the sum of its proper divisors (48611).

6640801 is a wasteful number, since it uses less digits than its factorization.

6640801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48610.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 6640801 is about 2576.9751648008. The cubic root of 6640801 is about 187.9634850615.

The spelling of 6640801 in words is "six million, six hundred forty thousand, eight hundred one".