5620666655221 has 2 divisors, whose sum is σ = 5620666655222. Its totient is φ = 5620666655220.

The previous prime is 5620666655207. The next prime is 5620666655243. The reversal of 5620666655221 is 1225566660265.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4812052062321 + 808614592900 = 2193639^2 + 899230^2 .

It is a cyclic number.

It is not a de Polignac number, because 5620666655221 - 2⁵ = 5620666655189 is a prime.

It is a super-2 number, since 2×5620666655221² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5620666655521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2810333327610 + 2810333327611.

It is an arithmetic number, because the mean of its divisors is an integer number (2810333327611).

Almost surely, 2^{5620666655221} is an apocalyptic number.

It is an amenable number.

5620666655221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5620666655221 is an equidigital number, since it uses as much as digits as its factorization.

5620666655221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776000, while the sum is 52.

The spelling of 5620666655221 in words is "five trillion, six hundred twenty billion, six hundred sixty-six million, six hundred fifty-five thousand, two hundred twenty-one".