18566242129 has 2 divisors, whose sum is σ = 18566242130. Its totient is φ = 18566242128.

The previous prime is 18566242127. The next prime is 18566242157. The reversal of 18566242129 is 92124266581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15788425104 + 2777817025 = 125652^2 + 52705^2 .

It is a cyclic number.

It is not a de Polignac number, because 18566242129 - 2¹ = 18566242127 is a prime.

Together with 18566242127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18566242127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9283121064 + 9283121065.

It is an arithmetic number, because the mean of its divisors is an integer number (9283121065).

Almost surely, 2^18566242129 is an apocalyptic number.

It is an amenable number.

18566242129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18566242129 is an equidigital number, since it uses as much as digits as its factorization.

18566242129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 46.

The spelling of 18566242129 in words is "eighteen billion, five hundred sixty-six million, two hundred forty-two thousand, one hundred twenty-nine".