6648637 has 2 divisors, whose sum is σ = 6648638. Its totient is φ = 6648636.

The previous prime is 6648623. The next prime is 6648647. The reversal of 6648637 is 7368466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6205081 + 443556 = 2491^2 + 666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6648637 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6648637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6648647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324318 + 3324319.

It is an arithmetic number, because the mean of its divisors is an integer number (3324319).

Almost surely, 2^6648637 is an apocalyptic number.

It is an amenable number.

6648637 is a deficient number, since it is larger than the sum of its proper divisors (1).

6648637 is an equidigital number, since it uses as much as digits as its factorization.

6648637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 40.

The square root of 6648637 is about 2578.4951037378. The cubic root of 6648637 is about 188.0373869360.

The spelling of 6648637 in words is "six million, six hundred forty-eight thousand, six hundred thirty-seven".