6665553 has 12 divisors (see below), whose sum is σ = 9659520. Its totient is φ = 4429176.

The previous prime is 6665539. The next prime is 6665567. The reversal of 6665553 is 3555666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6665539) and next prime (6665567).

It is not a de Polignac number, because 6665553 - 2⁴ = 6665537 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6665573) 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, 2200 + ... + 4262.

It is an arithmetic number, because the mean of its divisors is an integer number (804960).

Almost surely, 2^6665553 is an apocalyptic number.

It is an amenable number.

6665553 is a deficient number, since it is larger than the sum of its proper divisors (2993967).

6665553 is a wasteful number, since it uses less digits than its factorization.

6665553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428 (or 2425 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 6665553 is about 2581.7732278417. The cubic root of 6665553 is about 188.1967251880.

The spelling of 6665553 in words is "six million, six hundred sixty-five thousand, five hundred fifty-three".