6665761 has 4 divisors (see below), whose sum is σ = 6778800. Its totient is φ = 6552724.

The previous prime is 6665741. The next prime is 6665773. The reversal of 6665761 is 1675666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1675666 = 2 ⋅837833.

It is a cyclic number.

It is not a de Polignac number, because 6665761 - 2⁹ = 6665249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6665761.

It is not an unprimeable number, because it can be changed into a prime (6665741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56431 + ... + 56548.

It is an arithmetic number, because the mean of its divisors is an integer number (1694700).

Almost surely, 2^6665761 is an apocalyptic number.

It is an amenable number.

6665761 is a deficient number, since it is larger than the sum of its proper divisors (113039).

6665761 is a wasteful number, since it uses less digits than its factorization.

6665761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113038.

The product of its digits is 45360, while the sum is 37.

The square root of 6665761 is about 2581.8135099189. The cubic root of 6665761 is about 188.1986827406.

The spelling of 6665761 in words is "six million, six hundred sixty-five thousand, seven hundred sixty-one".