6691963 has 4 divisors (see below), whose sum is σ = 6786288. Its totient is φ = 6597640.

The previous prime is 6691943. The next prime is 6691969. The reversal of 6691963 is 3691966.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6691963 - 2¹⁷ = 6560891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6691969) 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, 47056 + ... + 47197.

It is an arithmetic number, because the mean of its divisors is an integer number (1696572).

Almost surely, 2^6691963 is an apocalyptic number.

6691963 is a deficient number, since it is larger than the sum of its proper divisors (94325).

6691963 is an equidigital number, since it uses as much as digits as its factorization.

6691963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94324.

The product of its digits is 52488, while the sum is 40.

The square root of 6691963 is about 2586.8828732666. The cubic root of 6691963 is about 188.4449529334. Note that the first 3 decimals are identical.

It can be divided in two parts, 66 and 91963, that added together give a palindrome (92029).

The spelling of 6691963 in words is "six million, six hundred ninety-one thousand, nine hundred sixty-three".