6745661 has 12 divisors (see below), whose sum is σ = 7535892. Its totient is φ = 6002304.

The previous prime is 6745657. The next prime is 6745663. The reversal of 6745661 is 1665476.

It can be written as a sum of positive squares in 6 ways, for example, as 1428025 + 5317636 = 1195^2 + 2306^2 .

It is not a de Polignac number, because 6745661 - 2² = 6745657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6745663) 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, 10625 + ... + 11241.

It is an arithmetic number, because the mean of its divisors is an integer number (627991).

Almost surely, 2^6745661 is an apocalyptic number.

It is an amenable number.

6745661 is a deficient number, since it is larger than the sum of its proper divisors (790231).

6745661 is a wasteful number, since it uses less digits than its factorization.

6745661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688 (or 659 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 6745661 is about 2597.2410361767. The cubic root of 6745661 is about 188.9476540084.

The spelling of 6745661 in words is "six million, seven hundred forty-five thousand, six hundred sixty-one".