6666558525 has 144 divisors (see below), whose sum is σ = 13900776960. Its totient is φ = 3126816000.

The previous prime is 6666558499. The next prime is 6666558553. The reversal of 6666558525 is 5258556666.

It is not a de Polignac number, because 6666558525 - 2²⁴ = 6649781309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2530609 + ... + 2533241.

Almost surely, 2^6666558525 is an apocalyptic number.

It is an amenable number.

6666558525 is an abundant number, since it is smaller than the sum of its proper divisors (7234218435).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6666558525 is a wasteful number, since it uses less digits than its factorization.

6666558525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2705 (or 2683 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 54.

The square root of 6666558525 is about 81648.9958603289. The cubic root of 6666558525 is about 1882.0618811866.

The spelling of 6666558525 in words is "six billion, six hundred sixty-six million, five hundred fifty-eight thousand, five hundred twenty-five".