18884705249 has 2 divisors, whose sum is σ = 18884705250. Its totient is φ = 18884705248.

The previous prime is 18884705183. The next prime is 18884705261. The reversal of 18884705249 is 94250748881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9486760000 + 9397945249 = 97400^2 + 96943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18884705249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18884705194 and 18884705203.

It is not a weakly prime, because it can be changed into another prime (18884705149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442352624 + 9442352625.

It is an arithmetic number, because the mean of its divisors is an integer number (9442352625).

Almost surely, 2^18884705249 is an apocalyptic number.

It is an amenable number.

18884705249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18884705249 is an equidigital number, since it uses as much as digits as its factorization.

18884705249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5160960, while the sum is 56.

The spelling of 18884705249 in words is "eighteen billion, eight hundred eighty-four million, seven hundred five thousand, two hundred forty-nine".