6466645 has 4 divisors (see below), whose sum is σ = 7759980. Its totient is φ = 5173312.

The previous prime is 6466633. The next prime is 6466661. The reversal of 6466645 is 5466646.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1912689 + 4553956 = 1383^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 6466645 - 2⁹ = 6466133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646660 + ... + 646669.

It is an arithmetic number, because the mean of its divisors is an integer number (1939995).

Almost surely, 2^6466645 is an apocalyptic number.

It is an amenable number.

6466645 is a deficient number, since it is larger than the sum of its proper divisors (1293335).

6466645 is a wasteful number, since it uses less digits than its factorization.

6466645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293334.

The product of its digits is 103680, while the sum is 37.

The square root of 6466645 is about 2542.9598895775. The cubic root of 6466645 is about 186.3057848304.

Subtracting from 6466645 its reverse (5466646), we obtain a palindrome (999999).

The spelling of 6466645 in words is "six million, four hundred sixty-six thousand, six hundred forty-five".