18200000261 has 2 divisors, whose sum is σ = 18200000262. Its totient is φ = 18200000260.

The previous prime is 18200000249. The next prime is 18200000281. The reversal of 18200000261 is 16200000281.

It is an a-pointer prime, because the next prime (18200000281) can be obtained adding 18200000261 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15618750625 + 2581249636 = 124975^2 + 50806^2 .

It is a cyclic number.

It is not a de Polignac number, because 18200000261 - 2⁶ = 18200000197 is a prime.

It is a super-3 number, since 3×18200000261³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18200000281) 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, 9100000130 + 9100000131.

It is an arithmetic number, because the mean of its divisors is an integer number (9100000131).

Almost surely, 2^18200000261 is an apocalyptic number.

It is an amenable number.

18200000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

18200000261 is an equidigital number, since it uses as much as digits as its factorization.

18200000261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 18200000261 its sum of digits (20), we get a palindrome (18200000281).

The spelling of 18200000261 in words is "eighteen billion, two hundred million, two hundred sixty-one", and thus it is an aban number.