6660541 has 4 divisors (see below), whose sum is σ = 6666592. Its totient is φ = 6654492.

The previous prime is 6660523. The next prime is 6660551. The reversal of 6660541 is 1450666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6660541 - 2⁵ = 6660509 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 (6660551) 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, 855 + ... + 3748.

It is an arithmetic number, because the mean of its divisors is an integer number (1666648).

Almost surely, 2^6660541 is an apocalyptic number.

It is an amenable number.

6660541 is a deficient number, since it is larger than the sum of its proper divisors (6051).

6660541 is a wasteful number, since it uses less digits than its factorization.

6660541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6050.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6660541 is about 2580.8023946052. The cubic root of 6660541 is about 188.1495433812.

The spelling of 6660541 in words is "six million, six hundred sixty thousand, five hundred forty-one".