6641661 has 8 divisors (see below), whose sum is σ = 9536800. Its totient is φ = 4087152.

The previous prime is 6641633. The next prime is 6641669. The reversal of 6641661 is 1661466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6641661 - 2⁹ = 6641149 is a prime.

It is a super-2 number, since 2×6641661² = 88223321677842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641669) 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, 85111 + ... + 85188.

It is an arithmetic number, because the mean of its divisors is an integer number (1192100).

Almost surely, 2^6641661 is an apocalyptic number.

It is an amenable number.

6641661 is a deficient number, since it is larger than the sum of its proper divisors (2895139).

6641661 is a wasteful number, since it uses less digits than its factorization.

6641661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170315.

The product of its digits is 5184, while the sum is 30.

The square root of 6641661 is about 2577.1420216977. The cubic root of 6641661 is about 187.9715986219.

The spelling of 6641661 in words is "six million, six hundred forty-one thousand, six hundred sixty-one".