17661849313 has 2 divisors, whose sum is σ = 17661849314. Its totient is φ = 17661849312.

The previous prime is 17661849307. The next prime is 17661849319. The reversal of 17661849313 is 31394816671.

It is a balanced prime because it is at equal distance from previous prime (17661849307) and next prime (17661849319).

It can be written as a sum of positive squares in only one way, i.e., 17655234129 + 6615184 = 132873^2 + 2572^2 .

It is an emirp because it is prime and its reverse (31394816671) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17661849313 - 2⁵ = 17661849281 is a prime.

It is not a weakly prime, because it can be changed into another prime (17661849319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8830924656 + 8830924657.

It is an arithmetic number, because the mean of its divisors is an integer number (8830924657).

Almost surely, 2^17661849313 is an apocalyptic number.

It is an amenable number.

17661849313 is a deficient number, since it is larger than the sum of its proper divisors (1).

17661849313 is an equidigital number, since it uses as much as digits as its factorization.

17661849313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The spelling of 17661849313 in words is "seventeen billion, six hundred sixty-one million, eight hundred forty-nine thousand, three hundred thirteen".