18025446209 has 2 divisors, whose sum is σ = 18025446210. Its totient is φ = 18025446208.

The previous prime is 18025446193. The next prime is 18025446269. The reversal of 18025446209 is 90264452081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17466265600 + 559180609 = 132160^2 + 23647^2 .

It is a cyclic number.

It is not a de Polignac number, because 18025446209 - 2⁴ = 18025446193 is a prime.

It is a super-2 number, since 2×18025446209² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18025446269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9012723104 + 9012723105.

It is an arithmetic number, because the mean of its divisors is an integer number (9012723105).

Almost surely, 2^18025446209 is an apocalyptic number.

It is an amenable number.

18025446209 is a deficient number, since it is larger than the sum of its proper divisors (1).

18025446209 is an equidigital number, since it uses as much as digits as its factorization.

18025446209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 18025446209 in words is "eighteen billion, twenty-five million, four hundred forty-six thousand, two hundred nine".