20001199511 has 2 divisors, whose sum is σ = 20001199512. Its totient is φ = 20001199510.

The previous prime is 20001199469. The next prime is 20001199513. The reversal of 20001199511 is 11599110002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001199511 - 2⁶ = 20001199447 is a prime.

Together with 20001199513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001199513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000599755 + 10000599756.

It is an arithmetic number, because the mean of its divisors is an integer number (10000599756).

Almost surely, 2^20001199511 is an apocalyptic number.

20001199511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001199511 is an equidigital number, since it uses as much as digits as its factorization.

20001199511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 29.

The spelling of 20001199511 in words is "twenty billion, one million, one hundred ninety-nine thousand, five hundred eleven".