20199638911 has 2 divisors, whose sum is σ = 20199638912. Its totient is φ = 20199638910.

The previous prime is 20199638903. The next prime is 20199638957. The reversal of 20199638911 is 11983699102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20199638911 - 2³ = 20199638903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20199638981) 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 as a sum of consecutive naturals, namely, 10099819455 + 10099819456.

It is an arithmetic number, because the mean of its divisors is an integer number (10099819456).

Almost surely, 2^20199638911 is an apocalyptic number.

20199638911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20199638911 is an equidigital number, since it uses as much as digits as its factorization.

20199638911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The spelling of 20199638911 in words is "twenty billion, one hundred ninety-nine million, six hundred thirty-eight thousand, nine hundred eleven".