18103694449 has 2 divisors, whose sum is σ = 18103694450. Its totient is φ = 18103694448.

The previous prime is 18103694377. The next prime is 18103694459. The reversal of 18103694449 is 94449630181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15991372849 + 2112321600 = 126457^2 + 45960^2 .

It is a cyclic number.

It is not a de Polignac number, because 18103694449 - 2¹¹ = 18103692401 is a prime.

It is not a weakly prime, because it can be changed into another prime (18103694459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9051847224 + 9051847225.

It is an arithmetic number, because the mean of its divisors is an integer number (9051847225).

Almost surely, 2^18103694449 is an apocalyptic number.

It is an amenable number.

18103694449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18103694449 is an equidigital number, since it uses as much as digits as its factorization.

18103694449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 18103694449 in words is "eighteen billion, one hundred three million, six hundred ninety-four thousand, four hundred forty-nine".