6666658125 has 20 divisors (see below), whose sum is σ = 11107544448. Its totient is φ = 3555550000.

The previous prime is 6666658121. The next prime is 6666658129. The reversal of 6666658125 is 5218566666.

It is an interprime number because it is at equal distance from previous prime (6666658121) and next prime (6666658129).

It is not a de Polignac number, because 6666658125 - 2² = 6666658121 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666658121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1775901 + ... + 1779650.

Almost surely, 2^6666658125 is an apocalyptic number.

It is an amenable number.

6666658125 is a deficient number, since it is larger than the sum of its proper divisors (4440886323).

6666658125 is an equidigital number, since it uses as much as digits as its factorization.

6666658125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555574 (or 3555559 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 51.

The square root of 6666658125 is about 81649.6057859436. The cubic root of 6666658125 is about 1882.0712539601.

The spelling of 6666658125 in words is "six billion, six hundred sixty-six million, six hundred fifty-eight thousand, one hundred twenty-five".