17661849419 has 2 divisors, whose sum is σ = 17661849420. Its totient is φ = 17661849418.

The previous prime is 17661849343. The next prime is 17661849421. The reversal of 17661849419 is 91494816671.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17661849419 is a prime.

It is a super-2 number, since 2×17661849419² (a number of 21 digits) contains 22 as substring.

Together with 17661849421, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (17661849119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8830924709 + 8830924710.

It is an arithmetic number, because the mean of its divisors is an integer number (8830924710).

Almost surely, 2^17661849419 is an apocalyptic number.

17661849419 is a deficient number, since it is larger than the sum of its proper divisors (1).

17661849419 is an equidigital number, since it uses as much as digits as its factorization.

17661849419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 56.

The spelling of 17661849419 in words is "seventeen billion, six hundred sixty-one million, eight hundred forty-nine thousand, four hundred nineteen".