5656721281271 has 24 divisors (see below), whose sum is σ = 6217017016320. Its totient is φ = 5140492041600.

The previous prime is 5656721281231. The next prime is 5656721281307. The reversal of 5656721281271 is 1721821276565.

It is a de Polignac number, because none of the positive numbers 2^k-5656721281271 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 (5656721281231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3213866 + ... + 4652136.

It is an arithmetic number, because the mean of its divisors is an integer number (259042375680).

Almost surely, 2^{5656721281271} is an apocalyptic number.

5656721281271 is a deficient number, since it is larger than the sum of its proper divisors (560295735049).

5656721281271 is a wasteful number, since it uses less digits than its factorization.

5656721281271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438775 (or 1438758 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 53.

The spelling of 5656721281271 in words is "five trillion, six hundred fifty-six billion, seven hundred twenty-one million, two hundred eighty-one thousand, two hundred seventy-one".