18825598489 has 2 divisors, whose sum is σ = 18825598490. Its totient is φ = 18825598488.

The previous prime is 18825598469. The next prime is 18825598523. The reversal of 18825598489 is 98489552881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18202596889 + 623001600 = 134917^2 + 24960^2 .

It is a cyclic number.

It is not a de Polignac number, because 18825598489 - 2⁹ = 18825597977 is a prime.

It is not a weakly prime, because it can be changed into another prime (18825598459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9412799244 + 9412799245.

It is an arithmetic number, because the mean of its divisors is an integer number (9412799245).

Almost surely, 2^18825598489 is an apocalyptic number.

It is an amenable number.

18825598489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18825598489 is an equidigital number, since it uses as much as digits as its factorization.

18825598489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66355200, while the sum is 67.

The spelling of 18825598489 in words is "eighteen billion, eight hundred twenty-five million, five hundred ninety-eight thousand, four hundred eighty-nine".