6681657 has 8 divisors (see below), whose sum is σ = 9077184. Its totient is φ = 4370288.

The previous prime is 6681637. The next prime is 6681671. The reversal of 6681657 is 7561866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6681657 - 2⁷ = 6681529 is a prime.

6681657 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6681637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20853 + ... + 21170.

It is an arithmetic number, because the mean of its divisors is an integer number (1134648).

Almost surely, 2^6681657 is an apocalyptic number.

It is an amenable number.

6681657 is a deficient number, since it is larger than the sum of its proper divisors (2395527).

6681657 is a wasteful number, since it uses less digits than its factorization.

6681657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42079.

The product of its digits is 60480, while the sum is 39.

The square root of 6681657 is about 2584.8901330618. The cubic root of 6681657 is about 188.3481646155.

The spelling of 6681657 in words is "six million, six hundred eighty-one thousand, six hundred fifty-seven".