998617725679 has 8 divisors (see below), whose sum is σ = 1142664135680. Its totient is φ = 854917999416.

The previous prime is 998617725659. The next prime is 998617725683. The reversal of 998617725679 is 976527716899.

It is a happy number.

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 998617725679 - 2¹⁷ = 998617594607 is a prime.

It is a super-2 number, since 2×998617725679² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998617725659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86664759 + ... + 86676280.

It is an arithmetic number, because the mean of its divisors is an integer number (142833016960).

Almost surely, 2^998617725679 is an apocalyptic number.

998617725679 is a deficient number, since it is larger than the sum of its proper divisors (144046410001).

998617725679 is a wasteful number, since it uses less digits than its factorization.

998617725679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173341869.

The product of its digits is 720135360, while the sum is 76.

The spelling of 998617725679 in words is "nine hundred ninety-eight billion, six hundred seventeen million, seven hundred twenty-five thousand, six hundred seventy-nine".