11123456678889 has 4 divisors (see below), whose sum is σ = 14831275571856. Its totient is φ = 7415637785924.

The previous prime is 11123456678879. The next prime is 11123456678899. The reversal of 11123456678889 is 98887665432111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (11123456678879) and next prime (11123456678899).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11123456678889 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (11123456678879) 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, 1853909446479 + ... + 1853909446484.

It is an arithmetic number, because the mean of its divisors is an integer number (3707818892964).

Almost surely, 2^{11123456678889} is an apocalyptic number.

It is an amenable number.

11123456678889 is a deficient number, since it is larger than the sum of its proper divisors (3707818892967).

11123456678889 is an equidigital number, since it uses as much as digits as its factorization.

11123456678889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707818892966.

The product of its digits is 139345920, while the sum is 69.

The spelling of 11123456678889 in words is "eleven trillion, one hundred twenty-three billion, four hundred fifty-six million, six hundred seventy-eight thousand, eight hundred eighty-nine".