18442507129 has 2 divisors, whose sum is σ = 18442507130. Its totient is φ = 18442507128.

The previous prime is 18442507099. The next prime is 18442507141. The reversal of 18442507129 is 92170524481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18131161104 + 311346025 = 134652^2 + 17645^2 .

It is a cyclic number.

It is not a de Polignac number, because 18442507129 - 2¹⁹ = 18441982841 is a prime.

It is not a weakly prime, because it can be changed into another prime (18442507169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9221253564 + 9221253565.

It is an arithmetic number, because the mean of its divisors is an integer number (9221253565).

Almost surely, 2^18442507129 is an apocalyptic number.

It is an amenable number.

18442507129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18442507129 is an equidigital number, since it uses as much as digits as its factorization.

18442507129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 18442507129 in words is "eighteen billion, four hundred forty-two million, five hundred seven thousand, one hundred twenty-nine".