6688009581 has 16 divisors (see below), whose sum is σ = 9729745920. Its totient is φ = 4052617520.

The previous prime is 6688009579. The next prime is 6688009589. The reversal of 6688009581 is 1859008866.

It is a cyclic number.

It is not a de Polignac number, because 6688009581 - 2¹ = 6688009579 is a prime.

It is a super-2 number, since 2×6688009581² = 89458944311095591122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688009589) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 215086 + ... + 244208.

It is an arithmetic number, because the mean of its divisors is an integer number (608109120).

Almost surely, 2^6688009581 is an apocalyptic number.

It is an amenable number.

6688009581 is a deficient number, since it is larger than the sum of its proper divisors (3041736339).

6688009581 is a wasteful number, since it uses less digits than its factorization.

6688009581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36096.

The product of its (nonzero) digits is 829440, while the sum is 51.

The square root of 6688009581 is about 81780.2517787760. The cubic root of 6688009581 is about 1884.0783633972.

The spelling of 6688009581 in words is "six billion, six hundred eighty-eight million, nine thousand, five hundred eighty-one".