19999868929 has 2 divisors, whose sum is σ = 19999868930. Its totient is φ = 19999868928.

The previous prime is 19999868923. The next prime is 19999868951. The reversal of 19999868929 is 92986899991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11097569025 + 8902299904 = 105345^2 + 94352^2 .

It is a cyclic number.

It is not a de Polignac number, because 19999868929 - 2⁵ = 19999868897 is a prime.

It is not a weakly prime, because it can be changed into another prime (19999868923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999934464 + 9999934465.

It is an arithmetic number, because the mean of its divisors is an integer number (9999934465).

Almost surely, 2^19999868929 is an apocalyptic number.

It is an amenable number.

19999868929 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999868929 is an equidigital number, since it uses as much as digits as its factorization.

19999868929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408146688, while the sum is 79.

The spelling of 19999868929 in words is "nineteen billion, nine hundred ninety-nine million, eight hundred sixty-eight thousand, nine hundred twenty-nine".