1816123187128 has 16 divisors (see below), whose sum is σ = 3409967052000. Its totient is φ = 906798639936.

The previous prime is 1816123187107. The next prime is 1816123187129. The reversal of 1816123187128 is 8217813216181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816123187129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157863093 + ... + 157874596.

It is an arithmetic number, because the mean of its divisors is an integer number (213122940750).

Almost surely, 2^{1816123187128} is an apocalyptic number.

It is an amenable number.

1816123187128 is a deficient number, since it is larger than the sum of its proper divisors (1593843864872).

1816123187128 is a wasteful number, since it uses less digits than its factorization.

1816123187128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315738414 (or 315738410 counting only the distinct ones).

The product of its digits is 258048, while the sum is 49.

The spelling of 1816123187128 in words is "one trillion, eight hundred sixteen billion, one hundred twenty-three million, one hundred eighty-seven thousand, one hundred twenty-eight".