123311816173 has 72 divisors (see below), whose sum is σ = 159194750976. Its totient is φ = 95158627200.

The previous prime is 123311816143. The next prime is 123311816183. The reversal of 123311816173 is 371618113321.

It is not a de Polignac number, because 123311816173 - 2²⁵ = 123278261741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123311816143) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 83827828 + ... + 83829298.

It is an arithmetic number, because the mean of its divisors is an integer number (2211038208).

Almost surely, 2^123311816173 is an apocalyptic number.

123311816173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123311816173 is a deficient number, since it is larger than the sum of its proper divisors (35882934803).

123311816173 is a wasteful number, since it uses less digits than its factorization.

123311816173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755 (or 1735 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

Adding to 123311816173 its reverse (371618113321), we get a palindrome (494929929494).

The spelling of 123311816173 in words is "one hundred twenty-three billion, three hundred eleven million, eight hundred sixteen thousand, one hundred seventy-three".