6643775 has 12 divisors (see below), whose sum is σ = 8275512. Its totient is φ = 5291040.

The previous prime is 6643739. The next prime is 6643781. The reversal of 6643775 is 5773466.

It is not a de Polignac number, because 6643775 - 2¹² = 6639679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6872 + ... + 7778.

It is an arithmetic number, because the mean of its divisors is an integer number (689626).

Almost surely, 2^6643775 is an apocalyptic number.

6643775 is a deficient number, since it is larger than the sum of its proper divisors (1631737).

6643775 is a wasteful number, since it uses less digits than its factorization.

6643775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210 (or 1205 counting only the distinct ones).

The product of its digits is 105840, while the sum is 38.

The square root of 6643775 is about 2577.5521333234. The cubic root of 6643775 is about 187.9915399090.

The spelling of 6643775 in words is "six million, six hundred forty-three thousand, seven hundred seventy-five".