11111233345678 has 32 divisors (see below), whose sum is σ = 17823649354560. Its totient is φ = 5182137143040.

The previous prime is 11111233345649. The next prime is 11111233345679. The reversal of 11111233345678 is 87654333211111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

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 (11111233345679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2902168 + ... + 5535796.

It is an arithmetic number, because the mean of its divisors is an integer number (556989042330).

Almost surely, 2^{11111233345678} is an apocalyptic number.

11111233345678 is a deficient number, since it is larger than the sum of its proper divisors (6712416008882).

11111233345678 is a wasteful number, since it uses less digits than its factorization.

11111233345678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635932.

The product of its digits is 362880, while the sum is 46.

Adding to 11111233345678 its reverse (87654333211111), we get a palindrome (98765566556789).

The spelling of 11111233345678 in words is "eleven trillion, one hundred eleven billion, two hundred thirty-three million, three hundred forty-five thousand, six hundred seventy-eight".