123111116156 has 12 divisors (see below), whose sum is σ = 246222232368. Its totient is φ = 52761906912.

The previous prime is 123111116143. The next prime is 123111116173. The reversal of 123111116156 is 651611111321.

123111116156 is an admirable number.

It is a super-2 number, since 2×123111116156² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2198412761 + ... + 2198412816.

It is an arithmetic number, because the mean of its divisors is an integer number (20518519364).

Almost surely, 2^123111116156 is an apocalyptic number.

It is an amenable number.

123111116156 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

123111116156 is a wasteful number, since it uses less digits than its factorization.

123111116156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396825588 (or 4396825586 counting only the distinct ones).

The product of its digits is 1080, while the sum is 29.

Adding to 123111116156 its reverse (651611111321), we get a palindrome (774722227477).

The spelling of 123111116156 in words is "one hundred twenty-three billion, one hundred eleven million, one hundred sixteen thousand, one hundred fifty-six".