6636985 has 12 divisors (see below), whose sum is σ = 8407908. Its totient is φ = 5028768.

The previous prime is 6636979. The next prime is 6636989. The reversal of 6636985 is 5896366.

It can be written as a sum of positive squares in 2 ways, for example, as 3904576 + 2732409 = 1976^2 + 1653^2 .

It is not a de Polignac number, because 6636985 - 2¹⁵ = 6604217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6636989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34 + ... + 3643.

It is an arithmetic number, because the mean of its divisors is an integer number (700659).

Almost surely, 2^6636985 is an apocalyptic number.

It is an amenable number.

6636985 is a deficient number, since it is larger than the sum of its proper divisors (1770923).

6636985 is a wasteful number, since it uses less digits than its factorization.

6636985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720 (or 3701 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 6636985 is about 2576.2346554613. The cubic root of 6636985 is about 187.9274750435.

The spelling of 6636985 in words is "six million, six hundred thirty-six thousand, nine hundred eighty-five".