18201920201 has 2 divisors, whose sum is σ = 18201920202. Its totient is φ = 18201920200.

The previous prime is 18201920189. The next prime is 18201920207. The reversal of 18201920201 is 10202910281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9417732025 + 8784188176 = 97045^2 + 93724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18201920201 is a prime.

It is not a weakly prime, because it can be changed into another prime (18201920207) 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, 9100960100 + 9100960101.

It is an arithmetic number, because the mean of its divisors is an integer number (9100960101).

Almost surely, 2^18201920201 is an apocalyptic number.

It is an amenable number.

18201920201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18201920201 is an equidigital number, since it uses as much as digits as its factorization.

18201920201 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 18201920201 in words is "eighteen billion, two hundred one million, nine hundred twenty thousand, two hundred one".