6706717661 has 12 divisors (see below), whose sum is σ = 8053361280. Its totient is φ = 5563174680.

The previous prime is 6706717657. The next prime is 6706717663. The reversal of 6706717661 is 1667176076.

It is a happy number.

It is not a de Polignac number, because 6706717661 - 2² = 6706717657 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 (6706717663) 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, 2206091 + ... + 2209128.

It is an arithmetic number, because the mean of its divisors is an integer number (671113440).

Almost surely, 2^6706717661 is an apocalyptic number.

It is an amenable number.

6706717661 is a deficient number, since it is larger than the sum of its proper divisors (1346643619).

6706717661 is a wasteful number, since it uses less digits than its factorization.

6706717661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4415264 (or 4415257 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 6706717661 is about 81894.5520837620. The cubic root of 6706717661 is about 1885.8334782226.

The spelling of 6706717661 in words is "six billion, seven hundred six million, seven hundred seventeen thousand, six hundred sixty-one".