6611661 has 12 divisors (see below), whose sum is σ = 10914592. Its totient is φ = 3778056.

The previous prime is 6611659. The next prime is 6611663. The reversal of 6611661 is 1661166.

6611661 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (6611659) and next prime (6611663).

It is not a de Polignac number, because 6611661 - 2¹ = 6611659 is a prime.

It is a super-2 number, since 2×6611661² = 87428122357842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6611663) 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, 52411 + ... + 52536.

Almost surely, 2^6611661 is an apocalyptic number.

It is an amenable number.

6611661 is a deficient number, since it is larger than the sum of its proper divisors (4302931).

6611661 is a wasteful number, since it uses less digits than its factorization.

6611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104960 (or 104957 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 6611661 is about 2571.3150332077. The cubic root of 6611661 is about 187.6881524630.

The spelling of 6611661 in words is "six million, six hundred eleven thousand, six hundred sixty-one".