6660512525 has 24 divisors (see below), whose sum is σ = 8468666304. Its totient is φ = 5193417600.

The previous prime is 6660512513. The next prime is 6660512539. The reversal of 6660512525 is 5252150666.

It is a happy number.

It is not a de Polignac number, because 6660512525 - 2⁶ = 6660512461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1333082 + ... + 1338068.

It is an arithmetic number, because the mean of its divisors is an integer number (352861096).

Almost surely, 2^6660512525 is an apocalyptic number.

It is an amenable number.

6660512525 is a deficient number, since it is larger than the sum of its proper divisors (1808153779).

6660512525 is a wasteful number, since it uses less digits than its factorization.

6660512525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6341 (or 6336 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 6660512525 is about 81611.9631242871. The cubic root of 6660512525 is about 1881.4927525656.

The spelling of 6660512525 in words is "six billion, six hundred sixty million, five hundred twelve thousand, five hundred twenty-five".