11888998549 has 4 divisors (see below), whose sum is σ = 11912356620. Its totient is φ = 11865640480.

The previous prime is 11888998519. The next prime is 11888998553. The reversal of 11888998549 is 94589988811.

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 7942017924 + 3946980625 = 89118^2 + 62825^2 .

It is a cyclic number.

It is not a de Polignac number, because 11888998549 - 2¹¹ = 11888996501 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 (11888998519) 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, 11678272 + ... + 11679289.

It is an arithmetic number, because the mean of its divisors is an integer number (2978089155).

Almost surely, 2^11888998549 is an apocalyptic number.

It is an amenable number.

11888998549 is a deficient number, since it is larger than the sum of its proper divisors (23358071).

11888998549 is an equidigital number, since it uses as much as digits as its factorization.

11888998549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23358070.

The product of its digits is 59719680, while the sum is 70.

The spelling of 11888998549 in words is "eleven billion, eight hundred eighty-eight million, nine hundred ninety-eight thousand, five hundred forty-nine".