18019345729 has 8 divisors (see below), whose sum is σ = 22465677888. Its totient is φ = 14041048560.

The previous prime is 18019345709. The next prime is 18019345739. The reversal of 18019345729 is 92754391081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18019345729 - 2⁵ = 18019345697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18019345709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117008662 + ... + 117008815.

It is an arithmetic number, because the mean of its divisors is an integer number (2808209736).

Almost surely, 2^18019345729 is an apocalyptic number.

It is an amenable number.

18019345729 is a deficient number, since it is larger than the sum of its proper divisors (4446332159).

18019345729 is a wasteful number, since it uses less digits than its factorization.

18019345729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234017495.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 18019345729 in words is "eighteen billion, nineteen million, three hundred forty-five thousand, seven hundred twenty-nine".