6661587 has 4 divisors (see below), whose sum is σ = 8882120. Its totient is φ = 4441056.

The previous prime is 6661583. The next prime is 6661597. The reversal of 6661587 is 7851666.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6661587 - 2² = 6661583 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661583) 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, 1110262 + ... + 1110267.

It is an arithmetic number, because the mean of its divisors is an integer number (2220530).

Almost surely, 2^6661587 is an apocalyptic number.

6661587 is a deficient number, since it is larger than the sum of its proper divisors (2220533).

6661587 is a wasteful number, since it uses less digits than its factorization.

6661587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220532.

The product of its digits is 60480, while the sum is 39.

The square root of 6661587 is about 2581.0050368025. The cubic root of 6661587 is about 188.1593921368.

The spelling of 6661587 in words is "six million, six hundred sixty-one thousand, five hundred eighty-seven".