11919658489 has 4 divisors (see below), whose sum is σ = 12082941556. Its totient is φ = 11756375424.

The previous prime is 11919658459. The next prime is 11919658571. The reversal of 11919658489 is 98485691911.

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 8173606464 + 3746052025 = 90408^2 + 61205^2 .

It is a cyclic number.

It is not a de Polignac number, because 11919658489 - 2¹⁵ = 11919625721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11919658459) 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, 81641424 + ... + 81641569.

It is an arithmetic number, because the mean of its divisors is an integer number (3020735389).

Almost surely, 2^11919658489 is an apocalyptic number.

It is an amenable number.

11919658489 is a deficient number, since it is larger than the sum of its proper divisors (163283067).

11919658489 is an equidigital number, since it uses as much as digits as its factorization.

11919658489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163283066.

The product of its digits is 5598720, while the sum is 61.

The spelling of 11919658489 in words is "eleven billion, nine hundred nineteen million, six hundred fifty-eight thousand, four hundred eighty-nine".