11985798499 has 4 divisors (see below), whose sum is σ = 12065174800. Its totient is φ = 11906422200.

The previous prime is 11985798497. The next prime is 11985798521. The reversal of 11985798499 is 99489758911.

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

It is a cyclic number.

It is not a de Polignac number, because 11985798499 - 2¹ = 11985798497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11985798497) 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, 39687924 + ... + 39688225.

It is an arithmetic number, because the mean of its divisors is an integer number (3016293700).

Almost surely, 2^11985798499 is an apocalyptic number.

11985798499 is a deficient number, since it is larger than the sum of its proper divisors (79376301).

11985798499 is an equidigital number, since it uses as much as digits as its factorization.

11985798499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79376300.

The product of its digits is 58786560, while the sum is 70.

The spelling of 11985798499 in words is "eleven billion, nine hundred eighty-five million, seven hundred ninety-eight thousand, four hundred ninety-nine".