6666553 has 4 divisors (see below), whose sum is σ = 6674148. Its totient is φ = 6658960.

The previous prime is 6666551. The next prime is 6666563. The reversal of 6666553 is 3556666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 501264 + 6165289 = 708^2 + 2483^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666553 - 2¹ = 6666551 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6666551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2278 + ... + 4303.

It is an arithmetic number, because the mean of its divisors is an integer number (1668537).

Almost surely, 2^6666553 is an apocalyptic number.

It is an amenable number.

6666553 is a deficient number, since it is larger than the sum of its proper divisors (7595).

6666553 is a wasteful number, since it uses less digits than its factorization.

6666553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7594.

The product of its digits is 97200, while the sum is 37.

The square root of 6666553 is about 2581.9668859224. The cubic root of 6666553 is about 188.2061361258.

The spelling of 6666553 in words is "six million, six hundred sixty-six thousand, five hundred fifty-three".