6660656525 has 24 divisors (see below), whose sum is σ = 8759796480. Its totient is φ = 5006626560.

The previous prime is 6660656507. The next prime is 6660656533. The reversal of 6660656525 is 5256560666.

6660656525 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6660656525 - 2¹⁰ = 6660655501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6660656525.

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, 245066 + ... + 270884.

It is an arithmetic number, because the mean of its divisors is an integer number (364991520).

Almost surely, 2^6660656525 is an apocalyptic number.

It is an amenable number.

6660656525 is a deficient number, since it is larger than the sum of its proper divisors (2099139955).

6660656525 is a wasteful number, since it uses less digits than its factorization.

6660656525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26453 (or 26448 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 47.

The square root of 6660656525 is about 81612.8453431199. The cubic root of 6660656525 is about 1881.5063117326.

The spelling of 6660656525 in words is "six billion, six hundred sixty million, six hundred fifty-six thousand, five hundred twenty-five".