123555205111 has 4 divisors (see below), whose sum is σ = 133059451672. Its totient is φ = 114050958552.

The previous prime is 123555205099. The next prime is 123555205117. The reversal of 123555205111 is 111502555321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111502555321 = 59 ⋅1889873819.

It is a cyclic number.

It is not a de Polignac number, because 123555205111 - 2¹¹ = 123555203063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123555205117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4752123261 + ... + 4752123286.

It is an arithmetic number, because the mean of its divisors is an integer number (33264862918).

Almost surely, 2^123555205111 is an apocalyptic number.

123555205111 is a deficient number, since it is larger than the sum of its proper divisors (9504246561).

123555205111 is an equidigital number, since it uses as much as digits as its factorization.

123555205111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504246560.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 123555205111 in words is "one hundred twenty-three billion, five hundred fifty-five million, two hundred five thousand, one hundred eleven".