18489477890249 has 4 divisors (see below), whose sum is σ = 18583333108164. Its totient is φ = 18395622672336.

The previous prime is 18489477890197. The next prime is 18489477890267. The reversal of 18489477890249 is 94209877498481.

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 10842815022649 + 7646662867600 = 3292843^2 + 2765260^2 .

It is a cyclic number.

It is not a de Polignac number, because 18489477890249 - 2¹² = 18489477886153 is a prime.

It is a super-2 number, since 2×18489477890249² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18489477890749) 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 3 ways as a sum of consecutive naturals, for example, 46927608662 + ... + 46927609055.

It is an arithmetic number, because the mean of its divisors is an integer number (4645833277041).

Almost surely, 2^{18489477890249} is an apocalyptic number.

It is an amenable number.

18489477890249 is a deficient number, since it is larger than the sum of its proper divisors (93855217915).

18489477890249 is an equidigital number, since it uses as much as digits as its factorization.

18489477890249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93855217914.

The product of its (nonzero) digits is 2341011456, while the sum is 80.

The spelling of 18489477890249 in words is "eighteen trillion, four hundred eighty-nine billion, four hundred seventy-seven million, eight hundred ninety thousand, two hundred forty-nine".