18129653869 has 2 divisors, whose sum is σ = 18129653870. Its totient is φ = 18129653868.

The previous prime is 18129653849. The next prime is 18129653887. The reversal of 18129653869 is 96835692181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17989515625 + 140138244 = 134125^2 + 11838^2 .

It is a cyclic number.

It is not a de Polignac number, because 18129653869 - 2⁷ = 18129653741 is a prime.

It is a super-2 number, since 2×18129653869² (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 (18129653849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9064826934 + 9064826935.

It is an arithmetic number, because the mean of its divisors is an integer number (9064826935).

Almost surely, 2^18129653869 is an apocalyptic number.

It is an amenable number.

18129653869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18129653869 is an equidigital number, since it uses as much as digits as its factorization.

18129653869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 58.

The spelling of 18129653869 in words is "eighteen billion, one hundred twenty-nine million, six hundred fifty-three thousand, eight hundred sixty-nine".