19677985898 has 16 divisors (see below), whose sum is σ = 29898053640. Its totient is φ = 9712490496.

The previous prime is 19677985889. The next prime is 19677985903. The reversal of 19677985898 is 89858977691.

It can be written as a sum of positive squares in 4 ways, for example, as 17517316609 + 2160669289 = 132353^2 + 46483^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54911 + ... + 205842.

Almost surely, 2^19677985898 is an apocalyptic number.

19677985898 is a deficient number, since it is larger than the sum of its proper divisors (10220067742).

19677985898 is a wasteful number, since it uses less digits than its factorization.

19677985898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261241.

The product of its digits is 548674560, while the sum is 77.

The spelling of 19677985898 in words is "nineteen billion, six hundred seventy-seven million, nine hundred eighty-five thousand, eight hundred ninety-eight".