6643633 has 2 divisors, whose sum is σ = 6643634. Its totient is φ = 6643632.

The previous prime is 6643607. The next prime is 6643649. The reversal of 6643633 is 3363466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6640929 + 2704 = 2577^2 + 52^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6643633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6643595 and 6643604.

It is not a weakly prime, because it can be changed into another prime (6643033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321816 + 3321817.

It is an arithmetic number, because the mean of its divisors is an integer number (3321817).

Almost surely, 2^6643633 is an apocalyptic number.

It is an amenable number.

6643633 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643633 is an equidigital number, since it uses as much as digits as its factorization.

6643633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 31.

The square root of 6643633 is about 2577.5245876616. The cubic root of 6643633 is about 187.9902005606.

The spelling of 6643633 in words is "six million, six hundred forty-three thousand, six hundred thirty-three".