6717661 has 4 divisors (see below), whose sum is σ = 6753024. Its totient is φ = 6682300.

The previous prime is 6717653. The next prime is 6717671. The reversal of 6717661 is 1667176.

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.

It is a cyclic number.

It is not a de Polignac number, because 6717661 - 2³ = 6717653 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6717671) 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, 17395 + ... + 17776.

It is an arithmetic number, because the mean of its divisors is an integer number (1688256).

Almost surely, 2^6717661 is an apocalyptic number.

It is an amenable number.

6717661 is a deficient number, since it is larger than the sum of its proper divisors (35363).

6717661 is a wasteful number, since it uses less digits than its factorization.

6717661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35362.

The product of its digits is 10584, while the sum is 34.

The square root of 6717661 is about 2591.8450956799. The cubic root of 6717661 is about 188.6858624533.

The spelling of 6717661 in words is "six million, seven hundred seventeen thousand, six hundred sixty-one".