991047568898 has 16 divisors (see below), whose sum is σ = 1514013910560. Its totient is φ = 486401225856.

The previous prime is 991047568837. The next prime is 991047568913. The reversal of 991047568898 is 898865740199.

991047568898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 6160340 + ... + 6319167.

It is an arithmetic number, because the mean of its divisors is an integer number (94625869410).

Almost surely, 2^991047568898 is an apocalyptic number.

991047568898 is a deficient number, since it is larger than the sum of its proper divisors (522966341662).

991047568898 is a wasteful number, since it uses less digits than its factorization.

991047568898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12480241.

The product of its (nonzero) digits is 313528320, while the sum is 74.

The spelling of 991047568898 in words is "nine hundred ninety-one billion, forty-seven million, five hundred sixty-eight thousand, eight hundred ninety-eight".