999998881178 has 32 divisors (see below), whose sum is σ = 1725471771840. Its totient is φ = 429875112960.

The previous prime is 999998881177. The next prime is 999998881199. The reversal of 999998881178 is 871188899999.

It is a self number, because there is not a number n which added to its sum of digits gives 999998881178.

It is not an unprimeable number, because it can be changed into a prime (999998881171) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 1831901 + ... + 2314272.

It is an arithmetic number, because the mean of its divisors is an integer number (53920992870).

Almost surely, 2^999998881178 is an apocalyptic number.

999998881178 is a deficient number, since it is larger than the sum of its proper divisors (725472890662).

999998881178 is a wasteful number, since it uses less digits than its factorization.

999998881178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4146782.

The product of its digits is 1693052928, while the sum is 86.

The spelling of 999998881178 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, eight hundred eighty-one thousand, one hundred seventy-eight".