6655666625 has 16 divisors (see below), whose sum is σ = 8310556800. Its totient is φ = 5321786800.

The previous prime is 6655666621. The next prime is 6655666627. The reversal of 6655666625 is 5266665566.

It is not a de Polignac number, because 6655666625 - 2² = 6655666621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6655666621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249692 + ... + 275058.

It is an arithmetic number, because the mean of its divisors is an integer number (519409800).

Almost surely, 2^6655666625 is an apocalyptic number.

It is an amenable number.

6655666625 is a deficient number, since it is larger than the sum of its proper divisors (1654890175).

6655666625 is a wasteful number, since it uses less digits than its factorization.

6655666625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27481 (or 27471 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 53.

The square root of 6655666625 is about 81582.2690601334. The cubic root of 6655666625 is about 1881.0363443557.

The spelling of 6655666625 in words is "six billion, six hundred fifty-five million, six hundred sixty-six thousand, six hundred twenty-five".