18098540989 has 8 divisors (see below), whose sum is σ = 18545011128. Its totient is φ = 17652311040.

The previous prime is 18098540983. The next prime is 18098541011. The reversal of 18098540989 is 98904589081.

It can be written as a sum of positive squares in 4 ways, for example, as 3344308900 + 14754232089 = 57830^2 + 121467^2 .

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 18098540989 - 2¹³ = 18098532797 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 (18098540983) 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, 97549 + ... + 213805.

It is an arithmetic number, because the mean of its divisors is an integer number (2318126391).

Almost surely, 2^18098540989 is an apocalyptic number.

It is an amenable number.

18098540989 is a deficient number, since it is larger than the sum of its proper divisors (446470139).

18098540989 is a wasteful number, since it uses less digits than its factorization.

18098540989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120095.

The product of its (nonzero) digits is 7464960, while the sum is 61.

The spelling of 18098540989 in words is "eighteen billion, ninety-eight million, five hundred forty thousand, nine hundred eighty-nine".