18669129823 has 2 divisors, whose sum is σ = 18669129824. Its totient is φ = 18669129822.

The previous prime is 18669129803. The next prime is 18669129851. The reversal of 18669129823 is 32892196681.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18669129823 is a prime.

It is a super-2 number, since 2×18669129823² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18669129803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9334564911 + 9334564912.

It is an arithmetic number, because the mean of its divisors is an integer number (9334564912).

Almost surely, 2^18669129823 is an apocalyptic number.

18669129823 is a deficient number, since it is larger than the sum of its proper divisors (1).

18669129823 is an equidigital number, since it uses as much as digits as its factorization.

18669129823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 55.

The spelling of 18669129823 in words is "eighteen billion, six hundred sixty-nine million, one hundred twenty-nine thousand, eight hundred twenty-three".