55545243121205 has 4 divisors (see below), whose sum is σ = 66654291745452. Its totient is φ = 44436194496960.

The previous prime is 55545243121169. The next prime is 55545243121217. The reversal of 55545243121205 is 50212134254555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32082244046161 + 23462999075044 = 5664119^2 + 4843862^2 .

It is not a de Polignac number, because 55545243121205 - 2¹⁶ = 55545243055669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5554524312116 + ... + 5554524312125.

It is an arithmetic number, because the mean of its divisors is an integer number (16663572936363).

Almost surely, 2^{55545243121205} is an apocalyptic number.

It is an amenable number.

55545243121205 is a deficient number, since it is larger than the sum of its proper divisors (11109048624247).

55545243121205 is a wasteful number, since it uses less digits than its factorization.

55545243121205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11109048624246.

The product of its (nonzero) digits is 1200000, while the sum is 44.

The spelling of 55545243121205 in words is "fifty-five trillion, five hundred forty-five billion, two hundred forty-three million, one hundred twenty-one thousand, two hundred five".