6656216071 has 16 divisors (see below), whose sum is σ = 6804442944. Its totient is φ = 6510034944.

The previous prime is 6656216041. The next prime is 6656216129. The reversal of 6656216071 is 1706126566.

It is a cyclic number.

It is not a de Polignac number, because 6656216071 - 2¹³ = 6656207879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656216011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3921495 + ... + 3923191.

It is an arithmetic number, because the mean of its divisors is an integer number (425277684).

Almost surely, 2^6656216071 is an apocalyptic number.

6656216071 is a deficient number, since it is larger than the sum of its proper divisors (148226873).

6656216071 is a wasteful number, since it uses less digits than its factorization.

6656216071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2250.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 6656216071 is about 81585.6364257827. The cubic root of 6656216071 is about 1881.0881047335.

The spelling of 6656216071 in words is "six billion, six hundred fifty-six million, two hundred sixteen thousand, seventy-one".