20018281819091 has 2 divisors, whose sum is σ = 20018281819092. Its totient is φ = 20018281819090.

The previous prime is 20018281819007. The next prime is 20018281819121. The reversal of 20018281819091 is 19091818281002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20018281819091 is a prime.

It is a super-3 number, since 3×20018281819091³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20018281839091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009140909545 + 10009140909546.

It is an arithmetic number, because the mean of its divisors is an integer number (10009140909546).

Almost surely, 2^{20018281819091} is an apocalyptic number.

20018281819091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018281819091 is an equidigital number, since it uses as much as digits as its factorization.

20018281819091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 50.

The spelling of 20018281819091 in words is "twenty trillion, eighteen billion, two hundred eighty-one million, eight hundred nineteen thousand, ninety-one".