6649633 has 2 divisors, whose sum is σ = 6649634. Its totient is φ = 6649632.

The previous prime is 6649631. The next prime is 6649661. The reversal of 6649633 is 3369466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6210064 + 439569 = 2492^2 + 663^2 .

It is a cyclic number.

It is not a de Polignac number, because 6649633 - 2¹ = 6649631 is a prime.

Together with 6649631, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6649592 and 6649601.

It is not a weakly prime, because it can be changed into another prime (6649631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324816 + 3324817.

It is an arithmetic number, because the mean of its divisors is an integer number (3324817).

Almost surely, 2^6649633 is an apocalyptic number.

It is an amenable number.

6649633 is a deficient number, since it is larger than the sum of its proper divisors (1).

6649633 is an equidigital number, since it uses as much as digits as its factorization.

6649633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 37.

The square root of 6649633 is about 2578.6882324159. The cubic root of 6649633 is about 188.0467761229.

The spelling of 6649633 in words is "six million, six hundred forty-nine thousand, six hundred thirty-three".