19998000002 has 4 divisors (see below), whose sum is σ = 29997000006. Its totient is φ = 9999000000.

The previous prime is 19997999971. The next prime is 19998000017. The reversal of 19998000002 is 20000089991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20000089991 = 7 ⋅2857155713.

It can be written as a sum of positive squares in only one way, i.e., 14323541761 + 5674458241 = 119681^2 + 75329^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19998000002.

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 as a sum of consecutive naturals, namely, 4999499999 + ... + 4999500002.

Almost surely, 2^19998000002 is an apocalyptic number.

19998000002 is a deficient number, since it is larger than the sum of its proper divisors (9999000004).

19998000002 is an equidigital number, since it uses as much as digits as its factorization.

19998000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9999000003.

The product of its (nonzero) digits is 11664, while the sum is 38.

Adding to 19998000002 its reverse (20000089991), we get a palindrome (39998089993).

The spelling of 19998000002 in words is "nineteen billion, nine hundred ninety-eight million, two", and thus it is an aban number.