6650557 has 2 divisors, whose sum is σ = 6650558. Its totient is φ = 6650556.

The previous prime is 6650533. The next prime is 6650561. The reversal of 6650557 is 7550566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4923961 + 1726596 = 2219^2 + 1314^2 .

It is a cyclic number.

It is not a de Polignac number, because 6650557 - 2¹⁵ = 6617789 is a prime.

6650557 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6650507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325278 + 3325279.

It is an arithmetic number, because the mean of its divisors is an integer number (3325279).

Almost surely, 2^6650557 is an apocalyptic number.

It is an amenable number.

6650557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6650557 is an equidigital number, since it uses as much as digits as its factorization.

6650557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31500, while the sum is 34.

The square root of 6650557 is about 2578.8673870519. The cubic root of 6650557 is about 188.0554857351.

Subtracting 6650557 from its reverse (7550566), we obtain a palindrome (900009).

The spelling of 6650557 in words is "six million, six hundred fifty thousand, five hundred fifty-seven".