20111287785811 has 2 divisors, whose sum is σ = 20111287785812. Its totient is φ = 20111287785810.

The previous prime is 20111287785803. The next prime is 20111287785817. The reversal of 20111287785811 is 11858778211102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111287785811 - 2³ = 20111287785803 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111287785817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055643892905 + 10055643892906.

It is an arithmetic number, because the mean of its divisors is an integer number (10055643892906).

Almost surely, 2^{20111287785811} is an apocalyptic number.

20111287785811 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111287785811 is an equidigital number, since it uses as much as digits as its factorization.

20111287785811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 501760, while the sum is 52.

The spelling of 20111287785811 in words is "twenty trillion, one hundred eleven billion, two hundred eighty-seven million, seven hundred eighty-five thousand, eight hundred eleven".