6921590656 has 16 divisors (see below), whose sum is σ = 13789106640. Its totient is φ = 3460795264.

The previous prime is 6921590633. The next prime is 6921590657. The reversal of 6921590656 is 6560951296.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921590657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27037336 + ... + 27037591.

It is an arithmetic number, because the mean of its divisors is an integer number (861819165).

Almost surely, 2^6921590656 is an apocalyptic number.

It is an amenable number.

6921590656 is a deficient number, since it is larger than the sum of its proper divisors (6867515984).

6921590656 is an equidigital number, since it uses as much as digits as its factorization.

6921590656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54074941 (or 54074929 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 49.

The square root of 6921590656 is about 83196.0976007889. The cubic root of 6921590656 is about 1905.7618862888.

The spelling of 6921590656 in words is "six billion, nine hundred twenty-one million, five hundred ninety thousand, six hundred fifty-six".