6661015 has 8 divisors (see below), whose sum is σ = 8007840. Its totient is φ = 5319072.

The previous prime is 6661013. The next prime is 6661021. The reversal of 6661015 is 5101666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6661015 - 2¹ = 6661013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661013) 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 7 ways as a sum of consecutive naturals, for example, 3342 + ... + 4948.

It is an arithmetic number, because the mean of its divisors is an integer number (1000980).

Almost surely, 2^6661015 is an apocalyptic number.

6661015 is a deficient number, since it is larger than the sum of its proper divisors (1346825).

6661015 is a wasteful number, since it uses less digits than its factorization.

6661015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 6661015 is about 2580.8942248763. The cubic root of 6661015 is about 188.1540065206.

It can be divided in two parts, 666 and 1015, that added together give a square (1681 = 41²).

The spelling of 6661015 in words is "six million, six hundred sixty-one thousand, fifteen".