6655666606 has 4 divisors (see below), whose sum is σ = 9983499912. Its totient is φ = 3327833302.

The previous prime is 6655666603. The next prime is 6655666621. The reversal of 6655666606 is 6066665566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6655666601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1663916650 + ... + 1663916653.

It is an arithmetic number, because the mean of its divisors is an integer number (2495874978).

Almost surely, 2^6655666606 is an apocalyptic number.

6655666606 is a deficient number, since it is larger than the sum of its proper divisors (3327833306).

6655666606 is a wasteful number, since it uses less digits than its factorization.

6655666606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327833305.

The product of its (nonzero) digits is 6998400, while the sum is 52.

The square root of 6655666606 is about 81582.2689436865. The cubic root of 6655666606 is about 1881.0363425658.

The spelling of 6655666606 in words is "six billion, six hundred fifty-five million, six hundred sixty-six thousand, six hundred six".