2656284573821 has 2 divisors, whose sum is σ = 2656284573822. Its totient is φ = 2656284573820.

The previous prime is 2656284573797. The next prime is 2656284573827. The reversal of 2656284573821 is 1283754826562.

2656284573821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2015508338596 + 640776235225 = 1419686^2 + 800485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2656284573821 - 2¹⁰ = 2656284572797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656284573827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328142286910 + 1328142286911.

It is an arithmetic number, because the mean of its divisors is an integer number (1328142286911).

Almost surely, 2^{2656284573821} is an apocalyptic number.

It is an amenable number.

2656284573821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656284573821 is an equidigital number, since it uses as much as digits as its factorization.

2656284573821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38707200, while the sum is 59.

The spelling of 2656284573821 in words is "two trillion, six hundred fifty-six billion, two hundred eighty-four million, five hundred seventy-three thousand, eight hundred twenty-one".