6691331966 has 8 divisors (see below), whose sum is σ = 10949452344. Its totient is φ = 3041514520.

The previous prime is 6691331963. The next prime is 6691332029.

It is a happy number.

6691331966 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691331963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152075705 + ... + 152075748.

It is an arithmetic number, because the mean of its divisors is an integer number (1368681543).

Almost surely, 2^6691331966 is an apocalyptic number.

6691331966 is a deficient number, since it is larger than the sum of its proper divisors (4258120378).

6691331966 is a wasteful number, since it uses less digits than its factorization.

6691331966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304151466.

The product of its digits is 944784, while the sum is 50.

The square root of 6691331966 is about 81800.5621374328. The cubic root of 6691331966 is about 1884.3902946416.

The spelling of 6691331966 in words is "six billion, six hundred ninety-one million, three hundred thirty-one thousand, nine hundred sixty-six".