18359868049 has 2 divisors, whose sum is σ = 18359868050. Its totient is φ = 18359868048.

The previous prime is 18359868041. The next prime is 18359868073. The reversal of 18359868049 is 94086895381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9968025600 + 8391842449 = 99840^2 + 91607^2 .

It is a cyclic number.

It is not a de Polignac number, because 18359868049 - 2³ = 18359868041 is a prime.

It is not a weakly prime, because it can be changed into another prime (18359868041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9179934024 + 9179934025.

It is an arithmetic number, because the mean of its divisors is an integer number (9179934025).

Almost surely, 2^18359868049 is an apocalyptic number.

It is an amenable number.

18359868049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18359868049 is an equidigital number, since it uses as much as digits as its factorization.

18359868049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 18359868049 in words is "eighteen billion, three hundred fifty-nine million, eight hundred sixty-eight thousand, forty-nine".