6617557 has 2 divisors, whose sum is σ = 6617558. Its totient is φ = 6617556.

The previous prime is 6617543. The next prime is 6617563. The reversal of 6617557 is 7557166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5564881 + 1052676 = 2359^2 + 1026^2 .

It is a cyclic number.

It is not a de Polignac number, because 6617557 - 2¹⁵ = 6584789 is a prime.

6617557 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6617057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308778 + 3308779.

It is an arithmetic number, because the mean of its divisors is an integer number (3308779).

Almost surely, 2^6617557 is an apocalyptic number.

It is an amenable number.

6617557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6617557 is an equidigital number, since it uses as much as digits as its factorization.

6617557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44100, while the sum is 37.

The square root of 6617557 is about 2572.4612727892. The cubic root of 6617557 is about 187.7439266760.

The spelling of 6617557 in words is "six million, six hundred seventeen thousand, five hundred fifty-seven".