11111223456678 has 16 divisors (see below), whose sum is σ = 23392049382720. Its totient is φ = 3508807407336.

The previous prime is 11111223456677. The next prime is 11111223456703. The reversal of 11111223456678 is 87665432211111.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111223456677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48733436100 + ... + 48733436327.

It is an arithmetic number, because the mean of its divisors is an integer number (1462003086420).

Almost surely, 2^{11111223456678} is an apocalyptic number.

11111223456678 is an abundant number, since it is smaller than the sum of its proper divisors (12280825926042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111223456678 is a wasteful number, since it uses less digits than its factorization.

11111223456678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97466872451.

The product of its digits is 483840, while the sum is 48.

Adding to 11111223456678 its reverse (87665432211111), we get a palindrome (98776655667789).

The spelling of 11111223456678 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-three million, four hundred fifty-six thousand, six hundred seventy-eight".