17818149049 has 2 divisors, whose sum is σ = 17818149050. Its totient is φ = 17818149048.

The previous prime is 17818149007. The next prime is 17818149103. The reversal of 17818149049 is 94094181871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16446780025 + 1371369024 = 128245^2 + 37032^2 .

It is a cyclic number.

It is not a de Polignac number, because 17818149049 - 2¹¹ = 17818147001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17818148987 and 17818149005.

It is not a weakly prime, because it can be changed into another prime (17818149949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8909074524 + 8909074525.

It is an arithmetic number, because the mean of its divisors is an integer number (8909074525).

Almost surely, 2^17818149049 is an apocalyptic number.

It is an amenable number.

17818149049 is a deficient number, since it is larger than the sum of its proper divisors (1).

17818149049 is an equidigital number, since it uses as much as digits as its factorization.

17818149049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 52.

The spelling of 17818149049 in words is "seventeen billion, eight hundred eighteen million, one hundred forty-nine thousand, forty-nine".