991047568895 has 8 divisors (see below), whose sum is σ = 1190178281040. Its totient is φ = 792223922880.

The previous prime is 991047568837. The next prime is 991047568913. The reversal of 991047568895 is 598865740199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 991047568895 - 2¹⁴ = 991047552511 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76759430 + ... + 76772339.

It is an arithmetic number, because the mean of its divisors is an integer number (148772285130).

Almost surely, 2^991047568895 is an apocalyptic number.

991047568895 is a deficient number, since it is larger than the sum of its proper divisors (199130712145).

991047568895 is a wasteful number, since it uses less digits than its factorization.

991047568895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153533065.

The product of its (nonzero) digits is 195955200, while the sum is 71.

The spelling of 991047568895 in words is "nine hundred ninety-one billion, forty-seven million, five hundred sixty-eight thousand, eight hundred ninety-five".