991716994175 has 24 divisors (see below), whose sum is σ = 1316696083200. Its totient is φ = 738314593280.

The previous prime is 991716994153. The next prime is 991716994181. The reversal of 991716994175 is 571499617199.

It is not a de Polignac number, because 991716994175 - 2⁸ = 991716993919 is a prime.

It is a hoax number, since the sum of its digits (68) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13071455 + ... + 13147104.

It is an arithmetic number, because the mean of its divisors is an integer number (54862336800).

Almost surely, 2^991716994175 is an apocalyptic number.

991716994175 is a deficient number, since it is larger than the sum of its proper divisors (324979089025).

991716994175 is a wasteful number, since it uses less digits than its factorization.

991716994175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26218675 (or 26218670 counting only the distinct ones).

The product of its digits is 38578680, while the sum is 68.

It can be divided in two parts, 991716 and 994175, that added together give a palindrome (1985891).

The spelling of 991716994175 in words is "nine hundred ninety-one billion, seven hundred sixteen million, nine hundred ninety-four thousand, one hundred seventy-five".