6666766559 has 8 divisors (see below), whose sum is σ = 6811803648. Its totient is φ = 6521862520.

The previous prime is 6666766549. The next prime is 6666766577. The reversal of 6666766559 is 9556676666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666766559 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 (6666766549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71594 + ... + 135864.

It is an arithmetic number, because the mean of its divisors is an integer number (851475456).

Almost surely, 2^6666766559 is an apocalyptic number.

6666766559 is a deficient number, since it is larger than the sum of its proper divisors (145037089).

6666766559 is a wasteful number, since it uses less digits than its factorization.

6666766559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66525.

The product of its digits is 73483200, while the sum is 62.

The square root of 6666766559 is about 81650.2698035959. The cubic root of 6666766559 is about 1882.0814579436.

The spelling of 6666766559 in words is "six billion, six hundred sixty-six million, seven hundred sixty-six thousand, five hundred fifty-nine".