18404178229 has 2 divisors, whose sum is σ = 18404178230. Its totient is φ = 18404178228.

The previous prime is 18404178227. The next prime is 18404178253. The reversal of 18404178229 is 92287140481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18190726129 + 213452100 = 134873^2 + 14610^2 .

It is a cyclic number.

It is not a de Polignac number, because 18404178229 - 2¹ = 18404178227 is a prime.

Together with 18404178227, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18404178227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9202089114 + 9202089115.

It is an arithmetic number, because the mean of its divisors is an integer number (9202089115).

Almost surely, 2^18404178229 is an apocalyptic number.

It is an amenable number.

18404178229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18404178229 is an equidigital number, since it uses as much as digits as its factorization.

18404178229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 18404178229 in words is "eighteen billion, four hundred four million, one hundred seventy-eight thousand, two hundred twenty-nine".