6661018 has 16 divisors (see below), whose sum is σ = 12297600. Its totient is φ = 2635056.

The previous prime is 6661013. The next prime is 6661021. The reversal of 6661018 is 8101666.

It is not an unprimeable number, because it can be changed into a prime (6661013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18118 + ... + 18481.

It is an arithmetic number, because the mean of its divisors is an integer number (768600).

Almost surely, 2^6661018 is an apocalyptic number.

6661018 is a deficient number, since it is larger than the sum of its proper divisors (5636582).

6661018 is a wasteful number, since it uses less digits than its factorization.

6661018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36621.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 6661018 is about 2580.8948060702. The cubic root of 6661018 is about 188.1540347676.

The spelling of 6661018 in words is "six million, six hundred sixty-one thousand, eighteen".