6991505966 has 32 divisors (see below), whose sum is σ = 10820304000. Its totient is φ = 3386216736.

The previous prime is 6991505953. The next prime is 6991505987. The reversal of 6991505966 is 6695051996.

It is a super-2 number, since 2×6991505966² = 97762311345227186312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8453645 + ... + 8454471.

It is an arithmetic number, because the mean of its divisors is an integer number (338134500).

Almost surely, 2^6991505966 is an apocalyptic number.

6991505966 is a deficient number, since it is larger than the sum of its proper divisors (3828798034).

6991505966 is a wasteful number, since it uses less digits than its factorization.

6991505966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568.

The product of its (nonzero) digits is 3936600, while the sum is 56.

The square root of 6991505966 is about 83615.2256828862. The cubic root of 6991505966 is about 1912.1571313867.

The spelling of 6991505966 in words is "six billion, nine hundred ninety-one million, five hundred five thousand, nine hundred sixty-six".