6557557 has 2 divisors, whose sum is σ = 6557558. Its totient is φ = 6557556.

The previous prime is 6557533. The next prime is 6557569. The reversal of 6557557 is 7557556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5958481 + 599076 = 2441^2 + 774^2 .

It is a cyclic number.

It is not a de Polignac number, because 6557557 - 2⁷ = 6557429 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6557657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278778 + 3278779.

It is an arithmetic number, because the mean of its divisors is an integer number (3278779).

Almost surely, 2^6557557 is an apocalyptic number.

It is an amenable number.

6557557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6557557 is an equidigital number, since it uses as much as digits as its factorization.

6557557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183750, while the sum is 40.

The square root of 6557557 is about 2560.7727349376. The cubic root of 6557557 is about 187.1747915291.

Subtracting 6557557 from its reverse (7557556), we obtain a palindrome (999999).

The spelling of 6557557 in words is "six million, five hundred fifty-seven thousand, five hundred fifty-seven".