6717361661 has 4 divisors (see below), whose sum is σ = 6717598524. Its totient is φ = 6717124800.

The previous prime is 6717361613. The next prime is 6717361709. The reversal of 6717361661 is 1661637176.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6717361613) and next prime (6717361709).

It can be written as a sum of positive squares in 2 ways, for example, as 3823567225 + 2893794436 = 61835^2 + 53794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6717361661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6717361601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69020 + ... + 134901.

It is an arithmetic number, because the mean of its divisors is an integer number (1679399631).

Almost surely, 2^6717361661 is an apocalyptic number.

It is an amenable number.

6717361661 is a deficient number, since it is larger than the sum of its proper divisors (236863).

6717361661 is a wasteful number, since it uses less digits than its factorization.

6717361661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236862.

The product of its digits is 190512, while the sum is 44.

The square root of 6717361661 is about 81959.5123277341. The cubic root of 6717361661 is about 1886.8305979739.

The spelling of 6717361661 in words is "six billion, seven hundred seventeen million, three hundred sixty-one thousand, six hundred sixty-one".