9991599226816 has 14 divisors (see below), whose sum is σ = 19827079715840. Its totient is φ = 4995799613376.

The previous prime is 9991599226799. The next prime is 9991599226841. The reversal of 9991599226816 is 6186229951999.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 78059368896 + ... + 78059369023.

Almost surely, 2^{9991599226816} is an apocalyptic number.

It is an amenable number.

9991599226816 is a deficient number, since it is larger than the sum of its proper divisors (9835480489024).

9991599226816 is a wasteful number, since it uses less digits than its factorization.

9991599226816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156118737931 (or 156118737921 counting only the distinct ones).

The product of its digits is 340122240, while the sum is 76.

The spelling of 9991599226816 in words is "nine trillion, nine hundred ninety-one billion, five hundred ninety-nine million, two hundred twenty-six thousand, eight hundred sixteen".