18385099589 has 4 divisors (see below), whose sum is σ = 18567130380. Its totient is φ = 18203068800.

The previous prime is 18385099553. The next prime is 18385099597. The reversal of 18385099589 is 98599058381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15570797089 + 2814302500 = 124783^2 + 53050^2 .

It is a cyclic number.

It is not a de Polignac number, because 18385099589 - 2¹² = 18385095493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18385093589) 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, 91015244 + ... + 91015445.

It is an arithmetic number, because the mean of its divisors is an integer number (4641782595).

Almost surely, 2^18385099589 is an apocalyptic number.

It is an amenable number.

18385099589 is a deficient number, since it is larger than the sum of its proper divisors (182030791).

18385099589 is a wasteful number, since it uses less digits than its factorization.

18385099589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182030790.

The product of its (nonzero) digits is 27993600, while the sum is 65.

The spelling of 18385099589 in words is "eighteen billion, three hundred eighty-five million, ninety-nine thousand, five hundred eighty-nine".