19998564835 has 16 divisors (see below), whose sum is σ = 24093248256. Its totient is φ = 15935613408.

The previous prime is 19998564827. The next prime is 19998564847. The reversal of 19998564835 is 53846589991.

It is a cyclic number.

It is not a de Polignac number, because 19998564835 - 2³ = 19998564827 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, 2733252 + ... + 2740558.

It is an arithmetic number, because the mean of its divisors is an integer number (1505828016).

Almost surely, 2^19998564835 is an apocalyptic number.

19998564835 is a deficient number, since it is larger than the sum of its proper divisors (4094683421).

19998564835 is a wasteful number, since it uses less digits than its factorization.

19998564835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9402.

The product of its digits is 83980800, while the sum is 67.

The spelling of 19998564835 in words is "nineteen billion, nine hundred ninety-eight million, five hundred sixty-four thousand, eight hundred thirty-five".