6656647612205 has 4 divisors (see below), whose sum is σ = 7987977134652. Its totient is φ = 5325318089760.

The previous prime is 6656647612193. The next prime is 6656647612243. The reversal of 6656647612205 is 5022167466566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4629025401289 + 2027622210916 = 2151517^2 + 1423946^2 .

It is not a de Polignac number, because 6656647612205 - 2⁸ = 6656647611949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665664761216 + ... + 665664761225.

It is an arithmetic number, because the mean of its divisors is an integer number (1996994283663).

Almost surely, 2^{6656647612205} is an apocalyptic number.

It is an amenable number.

6656647612205 is a deficient number, since it is larger than the sum of its proper divisors (1331329522447).

6656647612205 is a wasteful number, since it uses less digits than its factorization.

6656647612205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331329522446.

The product of its (nonzero) digits is 21772800, while the sum is 56.

The spelling of 6656647612205 in words is "six trillion, six hundred fifty-six billion, six hundred forty-seven million, six hundred twelve thousand, two hundred five".