998218351985 has 16 divisors (see below), whose sum is σ = 1199490066432. Its totient is φ = 797489784000.

The previous prime is 998218351859. The next prime is 998218352059. The reversal of 998218351985 is 589153812899.

998218351985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 998218351985 - 2⁸ = 998218351729 is a prime.

It is a Duffinian 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, 18771935 + ... + 18825035.

It is an arithmetic number, because the mean of its divisors is an integer number (74968129152).

Almost surely, 2^998218351985 is an apocalyptic number.

It is an amenable number.

998218351985 is a deficient number, since it is larger than the sum of its proper divisors (201271714447).

998218351985 is a wasteful number, since it uses less digits than its factorization.

998218351985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58144.

The product of its digits is 55987200, while the sum is 68.

The spelling of 998218351985 in words is "nine hundred ninety-eight billion, two hundred eighteen million, three hundred fifty-one thousand, nine hundred eighty-five".