20191725811 has 2 divisors, whose sum is σ = 20191725812. Its totient is φ = 20191725810.

The previous prime is 20191725793. The next prime is 20191725863. The reversal of 20191725811 is 11852719102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20191725811 - 2²⁷ = 20057508083 is a prime.

It is not a weakly prime, because it can be changed into another prime (20191755811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10095862905 + 10095862906.

It is an arithmetic number, because the mean of its divisors is an integer number (10095862906).

Almost surely, 2^20191725811 is an apocalyptic number.

20191725811 is a deficient number, since it is larger than the sum of its proper divisors (1).

20191725811 is an equidigital number, since it uses as much as digits as its factorization.

20191725811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 37.

The spelling of 20191725811 in words is "twenty billion, one hundred ninety-one million, seven hundred twenty-five thousand, eight hundred eleven".