18238472129 has 2 divisors, whose sum is σ = 18238472130. Its totient is φ = 18238472128.

The previous prime is 18238472111. The next prime is 18238472143. The reversal of 18238472129 is 92127483281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17728389904 + 510082225 = 133148^2 + 22585^2 .

It is a cyclic number.

It is not a de Polignac number, because 18238472129 - 2²⁰ = 18237423553 is a prime.

It is not a weakly prime, because it can be changed into another prime (18238472029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9119236064 + 9119236065.

It is an arithmetic number, because the mean of its divisors is an integer number (9119236065).

Almost surely, 2^18238472129 is an apocalyptic number.

It is an amenable number.

18238472129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18238472129 is an equidigital number, since it uses as much as digits as its factorization.

18238472129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 47.

The spelling of 18238472129 in words is "eighteen billion, two hundred thirty-eight million, four hundred seventy-two thousand, one hundred twenty-nine".