6661533 has 12 divisors (see below), whose sum is σ = 9375648. Its totient is φ = 4206600.

The previous prime is 6661511. The next prime is 6661547. The reversal of 6661533 is 3351666.

It is not a de Polignac number, because 6661533 - 2⁹ = 6661021 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6661533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661553) 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 11 ways as a sum of consecutive naturals, for example, 1993 + ... + 4158.

It is an arithmetic number, because the mean of its divisors is an integer number (781304).

Almost surely, 2^6661533 is an apocalyptic number.

It is an amenable number.

6661533 is a deficient number, since it is larger than the sum of its proper divisors (2714115).

6661533 is a wasteful number, since it uses less digits than its factorization.

6661533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6192 (or 6173 counting only the distinct ones).

The product of its digits is 9720, while the sum is 30.

The square root of 6661533 is about 2580.9945757401. The cubic root of 6661533 is about 188.1588837177.

The spelling of 6661533 in words is "six million, six hundred sixty-one thousand, five hundred thirty-three".