998617725680 has 20 divisors (see below), whose sum is σ = 2321786212392. Its totient is φ = 399447090240.

The previous prime is 998617725659. The next prime is 998617725683. The reversal of 998617725680 is 86527716899.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 998617725680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998617725683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6241360706 + ... + 6241360865.

Almost surely, 2^998617725680 is an apocalyptic number.

It is an amenable number.

998617725680 is an abundant number, since it is smaller than the sum of its proper divisors (1323168486712).

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

998617725680 is a wasteful number, since it uses less digits than its factorization.

998617725680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12482721584 (or 12482721578 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 68.

The spelling of 998617725680 in words is "nine hundred ninety-eight billion, six hundred seventeen million, seven hundred twenty-five thousand, six hundred eighty".