18426208329 has 12 divisors (see below), whose sum is σ = 27051956932. Its totient is φ = 12082759200.

The previous prime is 18426208313. The next prime is 18426208343. The reversal of 18426208329 is 92380262481.

18426208329 is a `hidden beast` number, since 18 + 4 + 2 + 620 + 8 + 3 + 2 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 491641929 + 17934566400 = 22173^2 + 133920^2 .

It is not a de Polignac number, because 18426208329 - 2⁴ = 18426208313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18426208309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16781062 + ... + 16782159.

Almost surely, 2^18426208329 is an apocalyptic number.

It is an amenable number.

18426208329 is a deficient number, since it is larger than the sum of its proper divisors (8625748603).

18426208329 is a wasteful number, since it uses less digits than its factorization.

18426208329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33563288 (or 33563285 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 18426208329 in words is "eighteen billion, four hundred twenty-six million, two hundred eight thousand, three hundred twenty-nine".