18202020191 has 2 divisors, whose sum is σ = 18202020192. Its totient is φ = 18202020190.

The previous prime is 18202020169. The next prime is 18202020217. The reversal of 18202020191 is 19102020281.

It is an a-pointer prime, because the next prime (18202020217) can be obtained adding 18202020191 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18202020191 - 2⁶ = 18202020127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18202020191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18202080191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9101010095 + 9101010096.

It is an arithmetic number, because the mean of its divisors is an integer number (9101010096).

Almost surely, 2^18202020191 is an apocalyptic number.

18202020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

18202020191 is an equidigital number, since it uses as much as digits as its factorization.

18202020191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 18202020191 in words is "eighteen billion, two hundred two million, twenty thousand, one hundred ninety-one".