56055055009981 has 2 divisors, whose sum is σ = 56055055009982. Its totient is φ = 56055055009980.

The previous prime is 56055055009979. The next prime is 56055055009999. The reversal of 56055055009981 is 18990055055065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42240705511225 + 13814349498756 = 6499285^2 + 3716766^2 .

It is a cyclic number.

It is not a de Polignac number, because 56055055009981 - 2¹ = 56055055009979 is a prime.

It is a super-2 number, since 2×56055055009981² (a number of 28 digits) contains 22 as substring.

Together with 56055055009979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56055055009951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28027527504990 + 28027527504991.

It is an arithmetic number, because the mean of its divisors is an integer number (28027527504991).

Almost surely, 2^{56055055009981} is an apocalyptic number.

It is an amenable number.

56055055009981 is a deficient number, since it is larger than the sum of its proper divisors (1).

56055055009981 is an equidigital number, since it uses as much as digits as its factorization.

56055055009981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150000, while the sum is 58.

The spelling of 56055055009981 in words is "fifty-six trillion, fifty-five billion, fifty-five million, nine thousand, nine hundred eighty-one".