991047568897 has 8 divisors (see below), whose sum is σ = 1043873734400. Its totient is φ = 938287980144.

The previous prime is 991047568837. The next prime is 991047568913. The reversal of 991047568897 is 798865740199.

991047568897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 991047568897 - 2⁷ = 991047568769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991047568807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16613622 + ... + 16673167.

It is an arithmetic number, because the mean of its divisors is an integer number (130484216800).

Almost surely, 2^991047568897 is an apocalyptic number.

It is an amenable number.

991047568897 is a deficient number, since it is larger than the sum of its proper divisors (52826165503).

991047568897 is a wasteful number, since it uses less digits than its factorization.

991047568897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33288375.

The product of its (nonzero) digits is 274337280, while the sum is 73.

The spelling of 991047568897 in words is "nine hundred ninety-one billion, forty-seven million, five hundred sixty-eight thousand, eight hundred ninety-seven".