55545243121099 has 2 divisors, whose sum is σ = 55545243121100. Its totient is φ = 55545243121098.

The previous prime is 55545243121097. The next prime is 55545243121169. The reversal of 55545243121099 is 99012134254555.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55545243121099 - 2¹ = 55545243121097 is a prime.

Together with 55545243121097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55545243121097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27772621560549 + 27772621560550.

It is an arithmetic number, because the mean of its divisors is an integer number (27772621560550).

Almost surely, 2^{55545243121099} is an apocalyptic number.

55545243121099 is a deficient number, since it is larger than the sum of its proper divisors (1).

55545243121099 is an equidigital number, since it uses as much as digits as its factorization.

55545243121099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720000, while the sum is 55.

The spelling of 55545243121099 in words is "fifty-five trillion, five hundred forty-five billion, two hundred forty-three million, one hundred twenty-one thousand, ninety-nine".