19128123864405 has 16 divisors (see below), whose sum is σ = 34005553536960. Its totient is φ = 10201666060944.

The previous prime is 19128123864403. The next prime is 19128123864413. The reversal of 19128123864405 is 50446832182191.

19128123864405 is a `hidden beast` number, since 1 + 91 + 2 + 81 + 2 + 38 + 6 + 440 + 5 = 666.

It is not a de Polignac number, because 19128123864405 - 2¹ = 19128123864403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19128123864401) 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, 70844903067 + ... + 70844903336.

It is an arithmetic number, because the mean of its divisors is an integer number (2125347096060).

Almost surely, 2^{19128123864405} is an apocalyptic number.

19128123864405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19128123864405 is a deficient number, since it is larger than the sum of its proper divisors (14877429672555).

19128123864405 is a wasteful number, since it uses less digits than its factorization.

19128123864405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141689806417 (or 141689806411 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 19128123864405 in words is "nineteen trillion, one hundred twenty-eight billion, one hundred twenty-three million, eight hundred sixty-four thousand, four hundred five".