18823422649 has 2 divisors, whose sum is σ = 18823422650. Its totient is φ = 18823422648.

The previous prime is 18823422643. The next prime is 18823422671. The reversal of 18823422649 is 94622432881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10308747024 + 8514675625 = 101532^2 + 92275^2 .

It is a cyclic number.

It is not a de Polignac number, because 18823422649 - 2¹⁹ = 18822898361 is a prime.

It is not a weakly prime, because it can be changed into another prime (18823422643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9411711324 + 9411711325.

It is an arithmetic number, because the mean of its divisors is an integer number (9411711325).

Almost surely, 2^18823422649 is an apocalyptic number.

It is an amenable number.

18823422649 is a deficient number, since it is larger than the sum of its proper divisors (1).

18823422649 is an equidigital number, since it uses as much as digits as its factorization.

18823422649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1327104, while the sum is 49.

The spelling of 18823422649 in words is "eighteen billion, eight hundred twenty-three million, four hundred twenty-two thousand, six hundred forty-nine".