18145397489 has 8 divisors (see below), whose sum is σ = 18571690368. Its totient is φ = 17720780560.

The previous prime is 18145397483. The next prime is 18145397503. The reversal of 18145397489 is 98479354181.

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

It is a cyclic number.

It is not a de Polignac number, because 18145397489 - 2¹² = 18145393393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18145397483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397067 + ... + 440400.

It is an arithmetic number, because the mean of its divisors is an integer number (2321461296).

Almost surely, 2^18145397489 is an apocalyptic number.

It is an amenable number.

18145397489 is a deficient number, since it is larger than the sum of its proper divisors (426292879).

18145397489 is an equidigital number, since it uses as much as digits as its factorization.

18145397489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837975.

The product of its digits is 8709120, while the sum is 59.

The spelling of 18145397489 in words is "eighteen billion, one hundred forty-five million, three hundred ninety-seven thousand, four hundred eighty-nine".