6635661 has 16 divisors (see below), whose sum is σ = 9777024. Its totient is φ = 3981824.

The previous prime is 6635659. The next prime is 6635663. The reversal of 6635661 is 1665366.

It is an interprime number because it is at equal distance from previous prime (6635659) and next prime (6635663).

It is a cyclic number.

It is not a de Polignac number, because 6635661 - 2¹ = 6635659 is a prime.

It is a super-4 number, since 4×6635661⁴ (a number of 28 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6635663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1656 + ... + 4001.

It is an arithmetic number, because the mean of its divisors is an integer number (611064).

Almost surely, 2^6635661 is an apocalyptic number.

It is an amenable number.

6635661 is a deficient number, since it is larger than the sum of its proper divisors (3141363).

6635661 is a wasteful number, since it uses less digits than its factorization.

6635661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700.

The product of its digits is 19440, while the sum is 33.

The square root of 6635661 is about 2575.9776784747. The cubic root of 6635661 is about 187.9149777764.

The spelling of 6635661 in words is "six million, six hundred thirty-five thousand, six hundred sixty-one".