18025446809 has 2 divisors, whose sum is σ = 18025446810. Its totient is φ = 18025446808.

The previous prime is 18025446787. The next prime is 18025446821. The reversal of 18025446809 is 90864452081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17943942025 + 81504784 = 133955^2 + 9028^2 .

It is a cyclic number.

It is not a de Polignac number, because 18025446809 - 2⁸ = 18025446553 is a prime.

It is not a weakly prime, because it can be changed into another prime (18025446209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9012723404 + 9012723405.

It is an arithmetic number, because the mean of its divisors is an integer number (9012723405).

Almost surely, 2^18025446809 is an apocalyptic number.

It is an amenable number.

18025446809 is a deficient number, since it is larger than the sum of its proper divisors (1).

18025446809 is an equidigital number, since it uses as much as digits as its factorization.

18025446809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 18025446809 in words is "eighteen billion, twenty-five million, four hundred forty-six thousand, eight hundred nine".