998617725678 has 32 divisors (see below), whose sum is σ = 2102514921216. Its totient is φ = 315582151808.

The previous prime is 998617725659. The next prime is 998617725683. The reversal of 998617725678 is 876527716899.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32003700 + ... + 32034887.

It is an arithmetic number, because the mean of its divisors is an integer number (65703591288).

Almost surely, 2^998617725678 is an apocalyptic number.

998617725678 is an abundant number, since it is smaller than the sum of its proper divisors (1103897195538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998617725678 is a wasteful number, since it uses less digits than its factorization.

998617725678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64038728.

The product of its digits is 640120320, while the sum is 75.

The spelling of 998617725678 in words is "nine hundred ninety-eight billion, six hundred seventeen million, seven hundred twenty-five thousand, six hundred seventy-eight".