17648245661 has 2 divisors, whose sum is σ = 17648245662. Its totient is φ = 17648245660.

The previous prime is 17648245633. The next prime is 17648245663. The reversal of 17648245661 is 16654284671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17401567225 + 246678436 = 131915^2 + 15706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17648245661 is a prime.

It is a super-2 number, since 2×17648245661² (a number of 21 digits) contains 22 as substring.

Together with 17648245663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17648245663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8824122830 + 8824122831.

It is an arithmetic number, because the mean of its divisors is an integer number (8824122831).

Almost surely, 2^17648245661 is an apocalyptic number.

It is an amenable number.

17648245661 is a deficient number, since it is larger than the sum of its proper divisors (1).

17648245661 is an equidigital number, since it uses as much as digits as its factorization.

17648245661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 50.

The spelling of 17648245661 in words is "seventeen billion, six hundred forty-eight million, two hundred forty-five thousand, six hundred sixty-one".