19663704859 has 4 divisors (see below), whose sum is σ = 19663996600. Its totient is φ = 19663413120.

The previous prime is 19663704821. The next prime is 19663704883. The reversal of 19663704859 is 95840736691.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 19663704859 - 2¹¹ = 19663702811 is a prime.

It is a super-2 number, since 2×19663704859² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19663704889) 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, 12667 + ... + 198715.

It is an arithmetic number, because the mean of its divisors is an integer number (4915999150).

Almost surely, 2^19663704859 is an apocalyptic number.

19663704859 is a deficient number, since it is larger than the sum of its proper divisors (291741).

19663704859 is a wasteful number, since it uses less digits than its factorization.

19663704859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291740.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 19663704859 in words is "nineteen billion, six hundred sixty-three million, seven hundred four thousand, eight hundred fifty-nine".