6660553 has 2 divisors, whose sum is σ = 6660554. Its totient is φ = 6660552.

The previous prime is 6660551. The next prime is 6660557. The reversal of 6660553 is 3550666.

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., 6615184 + 45369 = 2572^2 + 213^2 .

It is a cyclic number.

It is not a de Polignac number, because 6660553 - 2¹ = 6660551 is a prime.

Together with 6660551, it forms a pair of twin primes.

6660553 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6660551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330276 + 3330277.

It is an arithmetic number, because the mean of its divisors is an integer number (3330277).

Almost surely, 2^6660553 is an apocalyptic number.

It is an amenable number.

6660553 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660553 is an equidigital number, since it uses as much as digits as its factorization.

6660553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 6660553 is about 2580.8047194625. The cubic root of 6660553 is about 188.1496563747.

The spelling of 6660553 in words is "six million, six hundred sixty thousand, five hundred fifty-three".