5665566004981 has 2 divisors, whose sum is σ = 5665566004982. Its totient is φ = 5665566004980.

The previous prime is 5665566004939. The next prime is 5665566005083. The reversal of 5665566004981 is 1894006655665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4730912104356 + 934653900625 = 2175066^2 + 966775^2 .

It is a cyclic number.

It is not a de Polignac number, because 5665566004981 - 2¹⁷ = 5665565873909 is a prime.

It is a super-2 number, since 2×5665566004981² (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 (5665566004921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2832783002490 + 2832783002491.

It is an arithmetic number, because the mean of its divisors is an integer number (2832783002491).

Almost surely, 2^{5665566004981} is an apocalyptic number.

It is an amenable number.

5665566004981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5665566004981 is an equidigital number, since it uses as much as digits as its factorization.

5665566004981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656000, while the sum is 61.

The spelling of 5665566004981 in words is "five trillion, six hundred sixty-five billion, five hundred sixty-six million, four thousand, nine hundred eighty-one".