19911339887916 has 12 divisors (see below), whose sum is σ = 46459793071832. Its totient is φ = 6637113295968.

The previous prime is 19911339887851. The next prime is 19911339887927. The reversal of 19911339887916 is 61978893311991.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×19911339887916² (a number of 27 digits) contains 22 as substring.

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, 829639161985 + ... + 829639162008.

Almost surely, 2^{19911339887916} is an apocalyptic number.

It is an amenable number.

19911339887916 is an abundant number, since it is smaller than the sum of its proper divisors (26548453183916).

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

19911339887916 is a wasteful number, since it uses less digits than its factorization.

19911339887916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659278324000 (or 1659278323998 counting only the distinct ones).

The product of its digits is 158723712, while the sum is 75.

The spelling of 19911339887916 in words is "nineteen trillion, nine hundred eleven billion, three hundred thirty-nine million, eight hundred eighty-seven thousand, nine hundred sixteen".