18438971115029 has 2 divisors, whose sum is σ = 18438971115030. Its totient is φ = 18438971115028.

The previous prime is 18438971115013. The next prime is 18438971115073. The reversal of 18438971115029 is 92051117983481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17670715359025 + 768255756004 = 4203655^2 + 876502^2 .

It is a cyclic number.

It is not a de Polignac number, because 18438971115029 - 2⁴ = 18438971115013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18438971115079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9219485557514 + 9219485557515.

It is an arithmetic number, because the mean of its divisors is an integer number (9219485557515).

Almost surely, 2^{18438971115029} is an apocalyptic number.

It is an amenable number.

18438971115029 is a deficient number, since it is larger than the sum of its proper divisors (1).

18438971115029 is an equidigital number, since it uses as much as digits as its factorization.

18438971115029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 59.

The spelling of 18438971115029 in words is "eighteen trillion, four hundred thirty-eight billion, nine hundred seventy-one million, one hundred fifteen thousand, twenty-nine".