6661717617 has 8 divisors (see below), whose sum is σ = 8901476224. Its totient is φ = 4431552048.

The previous prime is 6661717583. The next prime is 6661717619. The reversal of 6661717617 is 7167171666.

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

It is a de Polignac number, because none of the positive numbers 2^k-6661717617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661717619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2396638 + ... + 2399415.

It is an arithmetic number, because the mean of its divisors is an integer number (1112684528).

Almost surely, 2^6661717617 is an apocalyptic number.

It is an amenable number.

6661717617 is a deficient number, since it is larger than the sum of its proper divisors (2239758607).

6661717617 is a wasteful number, since it uses less digits than its factorization.

6661717617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4796519.

The product of its digits is 444528, while the sum is 48.

The square root of 6661717617 is about 81619.3458501108. The cubic root of 6661717617 is about 1881.6062190656.

The spelling of 6661717617 in words is "six billion, six hundred sixty-one million, seven hundred seventeen thousand, six hundred seventeen".