998996691255 has 8 divisors (see below), whose sum is σ = 1598394706032. Its totient is φ = 532798235328.

The previous prime is 998996691239. The next prime is 998996691269. The reversal of 998996691255 is 552196699899.

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

It is not a de Polignac number, because 998996691255 - 2⁴ = 998996691239 is a prime.

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 33299889694 + ... + 33299889723.

It is an arithmetic number, because the mean of its divisors is an integer number (199799338254).

Almost surely, 2^998996691255 is an apocalyptic number.

998996691255 is a deficient number, since it is larger than the sum of its proper divisors (599398014777).

998996691255 is a wasteful number, since it uses less digits than its factorization.

998996691255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66599779425.

The product of its digits is 850305600, while the sum is 78.

The spelling of 998996691255 in words is "nine hundred ninety-eight billion, nine hundred ninety-six million, six hundred ninety-one thousand, two hundred fifty-five".