6921680559 has 16 divisors (see below), whose sum is σ = 9655345152. Its totient is φ = 4402284128.

The previous prime is 6921680533. The next prime is 6921680567. The reversal of 6921680559 is 9550861296.

6921680559 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6921680559 - 2¹⁶ = 6921615023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921680599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104532 + ... + 157385.

It is an arithmetic number, because the mean of its divisors is an integer number (603459072).

Almost surely, 2^6921680559 is an apocalyptic number.

6921680559 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

6921680559 is a deficient number, since it is larger than the sum of its proper divisors (2733664593).

6921680559 is a wasteful number, since it uses less digits than its factorization.

6921680559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262326.

The product of its (nonzero) digits is 1166400, while the sum is 51.

The square root of 6921680559 is about 83196.6379068289. The cubic root of 6921680559 is about 1905.7701374254.

The spelling of 6921680559 in words is "six billion, nine hundred twenty-one million, six hundred eighty thousand, five hundred fifty-nine".