18018218429 has 2 divisors, whose sum is σ = 18018218430. Its totient is φ = 18018218428.

The previous prime is 18018218401. The next prime is 18018218459. The reversal of 18018218429 is 92481281081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17158380100 + 859838329 = 130990^2 + 29323^2 .

It is a cyclic number.

It is not a de Polignac number, because 18018218429 - 2⁸ = 18018218173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18018218429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18018218459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9009109214 + 9009109215.

It is an arithmetic number, because the mean of its divisors is an integer number (9009109215).

Almost surely, 2^18018218429 is an apocalyptic number.

It is an amenable number.

18018218429 is a deficient number, since it is larger than the sum of its proper divisors (1).

18018218429 is an equidigital number, since it uses as much as digits as its factorization.

18018218429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 44.

The spelling of 18018218429 in words is "eighteen billion, eighteen million, two hundred eighteen thousand, four hundred twenty-nine".