18201920237 has 2 divisors, whose sum is σ = 18201920238. Its totient is φ = 18201920236.

The previous prime is 18201920207. The next prime is 18201920263. The reversal of 18201920237 is 73202910281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17649388201 + 552532036 = 132851^2 + 23506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18201920237 is a prime.

It is a super-2 number, since 2×18201920237² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18201920197 and 18201920206.

It is a congruent number.

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 (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9100960118 + 9100960119.

It is an arithmetic number, because the mean of its divisors is an integer number (9100960119).

Almost surely, 2^18201920237 is an apocalyptic number.

It is an amenable number.

18201920237 is a deficient number, since it is larger than the sum of its proper divisors (1).

18201920237 is an equidigital number, since it uses as much as digits as its factorization.

18201920237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 18201920237 in words is "eighteen billion, two hundred one million, nine hundred twenty thousand, two hundred thirty-seven".