6991294679 has 8 divisors (see below), whose sum is σ = 7082160960. Its totient is φ = 6900487776.

The previous prime is 6991294649. The next prime is 6991294699. The reversal of 6991294679 is 9764921996.

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

It is a cyclic number.

It is not a de Polignac number, because 6991294679 - 2⁸ = 6991294423 is a prime.

It is a super-2 number, since 2×6991294679² = 97756402577227426082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991294649) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 253349 + ... + 279585.

It is an arithmetic number, because the mean of its divisors is an integer number (885270120).

Almost surely, 2^6991294679 is an apocalyptic number.

6991294679 is a deficient number, since it is larger than the sum of its proper divisors (90866281).

6991294679 is a wasteful number, since it uses less digits than its factorization.

6991294679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29689.

The product of its digits is 13226976, while the sum is 62.

The square root of 6991294679 is about 83613.9622252169. The cubic root of 6991294679 is about 1912.1378690601.

The spelling of 6991294679 in words is "six billion, nine hundred ninety-one million, two hundred ninety-four thousand, six hundred seventy-nine".