19898998605 has 48 divisors (see below), whose sum is σ = 34782359040. Its totient is φ = 10523514624.

The previous prime is 19898998597. The next prime is 19898998621. The reversal of 19898998605 is 50689989891.

19898998605 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 8 + 9 + 9 + 8 + 605 = 666.

It is not a de Polignac number, because 19898998605 - 2³ = 19898998597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9758176 + ... + 9760214.

It is an arithmetic number, because the mean of its divisors is an integer number (724632480).

Almost surely, 2^19898998605 is an apocalyptic number.

19898998605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19898998605 is a deficient number, since it is larger than the sum of its proper divisors (14883360435).

19898998605 is a wasteful number, since it uses less digits than its factorization.

19898998605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3770 (or 3767 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 72.

The spelling of 19898998605 in words is "nineteen billion, eight hundred ninety-eight million, nine hundred ninety-eight thousand, six hundred five".