991347044216 has 8 divisors (see below), whose sum is σ = 1858775707920. Its totient is φ = 495673522104.

The previous prime is 991347044141. The next prime is 991347044231. The reversal of 991347044216 is 612440743199.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

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, 61959190256 + ... + 61959190271.

It is an arithmetic number, because the mean of its divisors is an integer number (232346963490).

Almost surely, 2^991347044216 is an apocalyptic number.

It is an amenable number.

991347044216 is a deficient number, since it is larger than the sum of its proper divisors (867428663704).

991347044216 is a wasteful number, since it uses less digits than its factorization.

991347044216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123918380533 (or 123918380529 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 991347044216 in words is "nine hundred ninety-one billion, three hundred forty-seven million, forty-four thousand, two hundred sixteen".