18024720449 has 2 divisors, whose sum is σ = 18024720450. Its totient is φ = 18024720448.

The previous prime is 18024720421. The next prime is 18024720451. The reversal of 18024720449 is 94402742081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18001052224 + 23668225 = 134168^2 + 4865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18024720449 is a prime.

Together with 18024720451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18024720419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9012360224 + 9012360225.

It is an arithmetic number, because the mean of its divisors is an integer number (9012360225).

Almost surely, 2^18024720449 is an apocalyptic number.

It is an amenable number.

18024720449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18024720449 is an equidigital number, since it uses as much as digits as its factorization.

18024720449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 18024720449 in words is "eighteen billion, twenty-four million, seven hundred twenty thousand, four hundred forty-nine".