6691056478 has 4 divisors (see below), whose sum is σ = 10036584720. Its totient is φ = 3345528238.

The previous prime is 6691056467. The next prime is 6691056487. The reversal of 6691056478 is 8746501966.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1672764118 + ... + 1672764121.

It is an arithmetic number, because the mean of its divisors is an integer number (2509146180).

Almost surely, 2^6691056478 is an apocalyptic number.

6691056478 is a deficient number, since it is larger than the sum of its proper divisors (3345528242).

6691056478 is a wasteful number, since it uses less digits than its factorization.

6691056478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3345528241.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 6691056478 is about 81798.8782196920. The cubic root of 6691056478 is about 1884.3644336202.

The spelling of 6691056478 in words is "six billion, six hundred ninety-one million, fifty-six thousand, four hundred seventy-eight".