6657 has 8 divisors (see below), whose sum is σ = 10176. Its totient is φ = 3792.

The previous prime is 6653. The next prime is 6659. The reversal of 6657 is 7566.

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

It is not a de Polignac number, because 6657 - 2² = 6653 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 6657.

It is not an unprimeable number, because it can be changed into a prime (6653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138 + ... + 179.

It is an arithmetic number, because the mean of its divisors is an integer number (1272).

It is a Proth number, since it is equal to 13 ⋅ 2⁹ + 1 and 13 < 2⁹.

2⁶⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

6657 is a deficient number, since it is larger than the sum of its proper divisors (3519).

6657 is a wasteful number, since it uses less digits than its factorization.

6657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327.

The product of its digits is 1260, while the sum is 24.

The square root of 6657 is about 81.5904406165. The cubic root of 6657 is about 18.8116194957.

Subtracting 6657 from its reverse (7566), we obtain a palindrome (909).

The spelling of 6657 in words is "six thousand, six hundred fifty-seven".