6655721606 has 8 divisors (see below), whose sum is σ = 10195999200. Its totient is φ = 3257055208.

The previous prime is 6655721591. The next prime is 6655721617. The reversal of 6655721606 is 6061275566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35402681 + ... + 35402868.

It is an arithmetic number, because the mean of its divisors is an integer number (1274499900).

Almost surely, 2^6655721606 is an apocalyptic number.

6655721606 is a deficient number, since it is larger than the sum of its proper divisors (3540277594).

6655721606 is a wasteful number, since it uses less digits than its factorization.

6655721606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70805598.

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 6655721606 is about 81582.6060260396. The cubic root of 6655721606 is about 1881.0415239508.

The spelling of 6655721606 in words is "six billion, six hundred fifty-five million, seven hundred twenty-one thousand, six hundred six".