19801990099 has 16 divisors (see below), whose sum is σ = 21277100736. Its totient is φ = 18361728000.

The previous prime is 19801990081. The next prime is 19801990111. The reversal of 19801990099 is 99009910891.

It is a cyclic number.

It is not a de Polignac number, because 19801990099 - 2⁷ = 19801989971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19801990069) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1995049 + ... + 2004949.

It is an arithmetic number, because the mean of its divisors is an integer number (1329818796).

Almost surely, 2^19801990099 is an apocalyptic number.

19801990099 is a deficient number, since it is larger than the sum of its proper divisors (1475110637).

19801990099 is a wasteful number, since it uses less digits than its factorization.

19801990099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11646.

The product of its (nonzero) digits is 472392, while the sum is 55.

The spelling of 19801990099 in words is "nineteen billion, eight hundred one million, nine hundred ninety thousand, ninety-nine".