6664553 has 12 divisors (see below), whose sum is σ = 7800192. Its totient is φ = 5577960.

The previous prime is 6664547. The next prime is 6664571. The reversal of 6664553 is 3554666.

It is not a de Polignac number, because 6664553 - 2²⁰ = 5615977 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15248 + ... + 15678.

It is an arithmetic number, because the mean of its divisors is an integer number (650016).

Almost surely, 2^6664553 is an apocalyptic number.

It is an amenable number.

6664553 is a deficient number, since it is larger than the sum of its proper divisors (1135639).

6664553 is an equidigital number, since it uses as much as digits as its factorization.

6664553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 485 counting only the distinct ones).

The product of its digits is 64800, while the sum is 35.

The square root of 6664553 is about 2581.5795552336. The cubic root of 6664553 is about 188.1873133089.

The spelling of 6664553 in words is "six million, six hundred sixty-four thousand, five hundred fifty-three".