6646963 has 4 divisors (see below), whose sum is σ = 6653440. Its totient is φ = 6640488.

The previous prime is 6646957. The next prime is 6646967. The reversal of 6646963 is 3696466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3696466 = 2 ⋅1848233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6646963 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6646967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1320 + ... + 3877.

It is an arithmetic number, because the mean of its divisors is an integer number (1663360).

Almost surely, 2^6646963 is an apocalyptic number.

6646963 is a deficient number, since it is larger than the sum of its proper divisors (6477).

6646963 is a wasteful number, since it uses less digits than its factorization.

6646963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6476.

The product of its digits is 139968, while the sum is 40.

The square root of 6646963 is about 2578.1704753565. The cubic root of 6646963 is about 188.0216042020.

The spelling of 6646963 in words is "six million, six hundred forty-six thousand, nine hundred sixty-three".