6643466 has 4 divisors (see below), whose sum is σ = 9965202. Its totient is φ = 3321732.

The previous prime is 6643453. The next prime is 6643487.

6643466 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4305625 + 2337841 = 2075^2 + 1529^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660865 + ... + 1660868.

Almost surely, 2^6643466 is an apocalyptic number.

6643466 is a deficient number, since it is larger than the sum of its proper divisors (3321736).

6643466 is a wasteful number, since it uses less digits than its factorization.

6643466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321735.

The product of its digits is 62208, while the sum is 35.

The square root of 6643466 is about 2577.4921920347. The cubic root of 6643466 is about 187.9886253870.

It can be divided in two parts, 664346 and 6, that multiplied together give a triangular number (3986076 = T₂₈₂₃).

The spelling of 6643466 in words is "six million, six hundred forty-three thousand, four hundred sixty-six".