55505560554989 has 2 divisors, whose sum is σ = 55505560554990. Its totient is φ = 55505560554988.

The previous prime is 55505560554979. The next prime is 55505560555007. The reversal of 55505560554989 is 98945506550555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40705459086889 + 14800101468100 = 6380083^2 + 3847090^2 .

It is a cyclic number.

It is not a de Polignac number, because 55505560554989 - 2¹⁶ = 55505560489453 is a prime.

It is a super-3 number, since 3×55505560554989³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55505560554929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27752780277494 + 27752780277495.

It is an arithmetic number, because the mean of its divisors is an integer number (27752780277495).

Almost surely, 2^{55505560554989} is an apocalyptic number.

It is an amenable number.

55505560554989 is a deficient number, since it is larger than the sum of its proper divisors (1).

55505560554989 is an equidigital number, since it uses as much as digits as its factorization.

55505560554989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215000000, while the sum is 71.

The spelling of 55505560554989 in words is "fifty-five trillion, five hundred five billion, five hundred sixty million, five hundred fifty-four thousand, nine hundred eighty-nine".