1111011111612 has 72 divisors (see below), whose sum is σ = 2883220900560. Its totient is φ = 360575804160.

The previous prime is 1111011111611. The next prime is 1111011111629. The reversal of 1111011111612 is 2161111101111.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111011111611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1972537 + ... + 2472432.

It is an arithmetic number, because the mean of its divisors is an integer number (40044734730).

Almost surely, 2^{1111011111612} is an apocalyptic number.

1111011111612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1111011111612 is an abundant number, since it is smaller than the sum of its proper divisors (1772209788948).

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

1111011111612 is a wasteful number, since it uses less digits than its factorization.

1111011111612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4445163 (or 4445158 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 18.

Adding to 1111011111612 its reverse (2161111101111), we get a palindrome (3272122212723).

The spelling of 1111011111612 in words is "one trillion, one hundred eleven billion, eleven million, one hundred eleven thousand, six hundred twelve".