18429389899 has 4 divisors (see below), whose sum is σ = 18430144720. Its totient is φ = 18428635080.

The previous prime is 18429389863. The next prime is 18429389917. The reversal of 18429389899 is 99898392481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18429389899 - 2²⁷ = 18295172171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18429389999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339519 + ... + 390040.

It is an arithmetic number, because the mean of its divisors is an integer number (4607536180).

Almost surely, 2^18429389899 is an apocalyptic number.

18429389899 is a deficient number, since it is larger than the sum of its proper divisors (754821).

18429389899 is an equidigital number, since it uses as much as digits as its factorization.

18429389899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754820.

The product of its digits is 80621568, while the sum is 70.

The spelling of 18429389899 in words is "eighteen billion, four hundred twenty-nine million, three hundred eighty-nine thousand, eight hundred ninety-nine".