6640453 has 2 divisors, whose sum is σ = 6640454. Its totient is φ = 6640452.

The previous prime is 6640451. The next prime is 6640463. The reversal of 6640453 is 3540466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3602404 + 3038049 = 1898^2 + 1743^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640453 - 2¹ = 6640451 is a prime.

Together with 6640451, it forms a pair of twin primes.

6640453 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6640451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320226 + 3320227.

It is an arithmetic number, because the mean of its divisors is an integer number (3320227).

Almost surely, 2^6640453 is an apocalyptic number.

It is an amenable number.

6640453 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640453 is an equidigital number, since it uses as much as digits as its factorization.

6640453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 6640453 is about 2576.9076428929. The cubic root of 6640453 is about 187.9602017008.

The spelling of 6640453 in words is "six million, six hundred forty thousand, four hundred fifty-three".