6666125579 has 4 divisors (see below), whose sum is σ = 6881161920. Its totient is φ = 6451089240.

The previous prime is 6666125551. The next prime is 6666125591. The reversal of 6666125579 is 9755216666.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666125579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6666125579.

It is not an unprimeable number, because it can be changed into a prime (6666125539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107518124 + ... + 107518185.

It is an arithmetic number, because the mean of its divisors is an integer number (1720290480).

Almost surely, 2^6666125579 is an apocalyptic number.

6666125579 is a deficient number, since it is larger than the sum of its proper divisors (215036341).

6666125579 is a wasteful number, since it uses less digits than its factorization.

6666125579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215036340.

The product of its digits is 4082400, while the sum is 53.

The square root of 6666125579 is about 81646.3445538133. The cubic root of 6666125579 is about 1882.0211380855.

The spelling of 6666125579 in words is "six billion, six hundred sixty-six million, one hundred twenty-five thousand, five hundred seventy-nine".