18171618029 has 2 divisors, whose sum is σ = 18171618030. Its totient is φ = 18171618028.

The previous prime is 18171617963. The next prime is 18171618079. The reversal of 18171618029 is 92081617181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16952560804 + 1219057225 = 130202^2 + 34915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18171618029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18171618079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9085809014 + 9085809015.

It is an arithmetic number, because the mean of its divisors is an integer number (9085809015).

Almost surely, 2^18171618029 is an apocalyptic number.

It is an amenable number.

18171618029 is a deficient number, since it is larger than the sum of its proper divisors (1).

18171618029 is an equidigital number, since it uses as much as digits as its factorization.

18171618029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 44.

The spelling of 18171618029 in words is "eighteen billion, one hundred seventy-one million, six hundred eighteen thousand, twenty-nine".