6919990856 has 16 divisors (see below), whose sum is σ = 13251047040. Its totient is φ = 3386378320.

The previous prime is 6919990843. The next prime is 6919990871. The reversal of 6919990856 is 6580999196.

It is a super-2 number, since 2×6919990856² = 95772546894247225472, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 9201740 + ... + 9202491.

It is an arithmetic number, because the mean of its divisors is an integer number (828190440).

Almost surely, 2^6919990856 is an apocalyptic number.

It is an amenable number.

6919990856 is a deficient number, since it is larger than the sum of its proper divisors (6331056184).

6919990856 is a wasteful number, since it uses less digits than its factorization.

6919990856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18404284 (or 18404280 counting only the distinct ones).

The product of its (nonzero) digits is 9447840, while the sum is 62.

The square root of 6919990856 is about 83186.4824115072. The cubic root of 6919990856 is about 1905.6150475566.

The spelling of 6919990856 in words is "six billion, nine hundred nineteen million, nine hundred ninety thousand, eight hundred fifty-six".