6616657 has 2 divisors, whose sum is σ = 6616658. Its totient is φ = 6616656.

The previous prime is 6616651. The next prime is 6616667. The reversal of 6616657 is 7566166.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6533136 + 83521 = 2556^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 6616657 - 2⁷ = 6616529 is a prime.

It is not a weakly prime, because it can be changed into another prime (6616651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308328 + 3308329.

It is an arithmetic number, because the mean of its divisors is an integer number (3308329).

Almost surely, 2^6616657 is an apocalyptic number.

It is an amenable number.

6616657 is a deficient number, since it is larger than the sum of its proper divisors (1).

6616657 is an equidigital number, since it uses as much as digits as its factorization.

6616657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 6616657 is about 2572.2863370939. The cubic root of 6616657 is about 187.7354151163.

The spelling of 6616657 in words is "six million, six hundred sixteen thousand, six hundred fifty-seven".