6618985 has 4 divisors (see below), whose sum is σ = 7942788. Its totient is φ = 5295184.

The previous prime is 6618979. The next prime is 6618991. The reversal of 6618985 is 5898166.

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

It is an interprime number because it is at equal distance from previous prime (6618979) and next prime (6618991).

It can be written as a sum of positive squares in 2 ways, for example, as 3125824 + 3493161 = 1768^2 + 1869^2 .

It is a cyclic number.

It is not a de Polignac number, because 6618985 - 2²¹ = 4521833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661894 + ... + 661903.

It is an arithmetic number, because the mean of its divisors is an integer number (1985697).

Almost surely, 2^6618985 is an apocalyptic number.

It is an amenable number.

6618985 is a deficient number, since it is larger than the sum of its proper divisors (1323803).

6618985 is a wasteful number, since it uses less digits than its factorization.

6618985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323802.

The product of its digits is 103680, while the sum is 43.

The square root of 6618985 is about 2572.7388130162. The cubic root of 6618985 is about 187.7574301006.

The spelling of 6618985 in words is "six million, six hundred eighteen thousand, nine hundred eighty-five".