18959016649 has 2 divisors, whose sum is σ = 18959016650. Its totient is φ = 18959016648.

The previous prime is 18959016647. The next prime is 18959016689. The reversal of 18959016649 is 94661095981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18573601225 + 385415424 = 136285^2 + 19632^2 .

It is a cyclic number.

It is not a de Polignac number, because 18959016649 - 2¹ = 18959016647 is a prime.

Together with 18959016647, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18959016593 and 18959016602.

It is not a weakly prime, because it can be changed into another prime (18959016647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9479508324 + 9479508325.

It is an arithmetic number, because the mean of its divisors is an integer number (9479508325).

Almost surely, 2^18959016649 is an apocalyptic number.

It is an amenable number.

18959016649 is a deficient number, since it is larger than the sum of its proper divisors (1).

18959016649 is an equidigital number, since it uses as much as digits as its factorization.

18959016649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 58.

The spelling of 18959016649 in words is "eighteen billion, nine hundred fifty-nine million, sixteen thousand, six hundred forty-nine".