19880999999 has 32 divisors (see below), whose sum is σ = 24636917760. Its totient is φ = 15662419200.

The previous prime is 19880999977. The next prime is 19881000001. The reversal of 19880999999 is 99999908891.

It is a Cunningham number, because it is equal to 141000²-1.

It is a cyclic number.

It is not a de Polignac number, because 19880999999 - 2¹² = 19880995903 is a prime.

19880999999 is a modest number, since divided by 999999 gives 19880 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19880999399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 976922 + ... + 997064.

It is an arithmetic number, because the mean of its divisors is an integer number (769903680).

Almost surely, 2^19880999999 is an apocalyptic number.

19880999999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19880999999 is a deficient number, since it is larger than the sum of its proper divisors (4755917761).

19880999999 is a wasteful number, since it uses less digits than its factorization.

19880999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20391.

The product of its (nonzero) digits is 306110016, while the sum is 80.

The spelling of 19880999999 in words is "nineteen billion, eight hundred eighty million, nine hundred ninety-nine thousand, nine hundred ninety-nine".