18290181449 has 2 divisors, whose sum is σ = 18290181450. Its totient is φ = 18290181448.

The previous prime is 18290181409. The next prime is 18290181487. The reversal of 18290181449 is 94418109281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12553633849 + 5736547600 = 112043^2 + 75740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18290181449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18290181409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9145090724 + 9145090725.

It is an arithmetic number, because the mean of its divisors is an integer number (9145090725).

Almost surely, 2^18290181449 is an apocalyptic number.

It is an amenable number.

18290181449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18290181449 is an equidigital number, since it uses as much as digits as its factorization.

18290181449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 47.

The spelling of 18290181449 in words is "eighteen billion, two hundred ninety million, one hundred eighty-one thousand, four hundred forty-nine".