18098589893 has 4 divisors (see below), whose sum is σ = 18122004108. Its totient is φ = 18075175680.

The previous prime is 18098589863. The next prime is 18098589919. The reversal of 18098589893 is 39898589081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39898589081 = 13 ⋅3069122237.

It can be written as a sum of positive squares in 2 ways, for example, as 2963931364 + 15134658529 = 54442^2 + 123023^2 .

It is a cyclic number.

It is not a de Polignac number, because 18098589893 - 2¹⁰ = 18098588869 is a prime.

It is a super-3 number, since 3×18098589893³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18098589863) 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, 11705948 + ... + 11707493.

It is an arithmetic number, because the mean of its divisors is an integer number (4530501027).

Almost surely, 2^18098589893 is an apocalyptic number.

It is an amenable number.

18098589893 is a deficient number, since it is larger than the sum of its proper divisors (23414215).

18098589893 is an equidigital number, since it uses as much as digits as its factorization.

18098589893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23414214.

The product of its (nonzero) digits is 44789760, while the sum is 68.

Adding to 18098589893 its sum of digits (68), we get a square (18098589961 = 134531²).

The spelling of 18098589893 in words is "eighteen billion, ninety-eight million, five hundred eighty-nine thousand, eight hundred ninety-three".