18655996123 has 2 divisors, whose sum is σ = 18655996124. Its totient is φ = 18655996122.

The previous prime is 18655996103. The next prime is 18655996147. The reversal of 18655996123 is 32169955681.

It is a weak prime.

It is an emirp because it is prime and its reverse (32169955681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18655996123 - 2⁵ = 18655996091 is a prime.

It is a super-2 number, since 2×18655996123² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18655996103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9327998061 + 9327998062.

It is an arithmetic number, because the mean of its divisors is an integer number (9327998062).

Almost surely, 2^18655996123 is an apocalyptic number.

18655996123 is a deficient number, since it is larger than the sum of its proper divisors (1).

18655996123 is an equidigital number, since it uses as much as digits as its factorization.

18655996123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3499200, while the sum is 55.

The spelling of 18655996123 in words is "eighteen billion, six hundred fifty-five million, nine hundred ninety-six thousand, one hundred twenty-three".