55356577565281 has 2 divisors, whose sum is σ = 55356577565282. Its totient is φ = 55356577565280.

The previous prime is 55356577565227. The next prime is 55356577565363. The reversal of 55356577565281 is 18256577565355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46467330723025 + 8889246842256 = 6816695^2 + 2981484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55356577565281 is a prime.

It is a super-2 number, since 2×55356577565281² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55356577565281.

It is not a weakly prime, because it can be changed into another prime (55356577565881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27678288782640 + 27678288782641.

It is an arithmetic number, because the mean of its divisors is an integer number (27678288782641).

Almost surely, 2^{55356577565281} is an apocalyptic number.

It is an amenable number.

55356577565281 is a deficient number, since it is larger than the sum of its proper divisors (1).

55356577565281 is an equidigital number, since it uses as much as digits as its factorization.

55356577565281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1323000000, while the sum is 70.

The spelling of 55356577565281 in words is "fifty-five trillion, three hundred fifty-six billion, five hundred seventy-seven million, five hundred sixty-five thousand, two hundred eighty-one".