55545243121123 has 24 divisors (see below), whose sum is σ = 68428492632864. Its totient is φ = 44800553952000.

The previous prime is 55545243121099. The next prime is 55545243121169. The reversal of 55545243121123 is 32112134254555.

It is not a de Polignac number, because 55545243121123 - 2⁴¹ = 53346219865571 is a prime.

It is a super-2 number, since 2×55545243121123² (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 55545243121123.

It is not an unprimeable number, because it can be changed into a prime (55545243121223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2609908 + ... + 10858273.

It is an arithmetic number, because the mean of its divisors is an integer number (2851187193036).

Almost surely, 2^{55545243121123} is an apocalyptic number.

55545243121123 is a deficient number, since it is larger than the sum of its proper divisors (12883249511741).

55545243121123 is a wasteful number, since it uses less digits than its factorization.

55545243121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13473163 (or 13473156 counting only the distinct ones).

The product of its digits is 720000, while the sum is 43.

Adding to 55545243121123 its reverse (32112134254555), we get a palindrome (87657377375678).

The spelling of 55545243121123 in words is "fifty-five trillion, five hundred forty-five billion, two hundred forty-three million, one hundred twenty-one thousand, one hundred twenty-three".