19999818182016 has 96 divisors (see below), whose sum is σ = 57552700509720. Its totient is φ = 6666473963520.

The previous prime is 19999818181979. The next prime is 19999818182027. The reversal of 19999818182016 is 61028181899991.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70638751 + ... + 70921313.

Almost surely, 2^{19999818182016} is an apocalyptic number.

19999818182016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19999818182016 is an abundant number, since it is smaller than the sum of its proper divisors (37552882327704).

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

19999818182016 is a wasteful number, since it uses less digits than its factorization.

19999818182016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344024 (or 344009 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 72.

The spelling of 19999818182016 in words is "nineteen trillion, nine hundred ninety-nine billion, eight hundred eighteen million, one hundred eighty-two thousand, sixteen".