17661849911 has 2 divisors, whose sum is σ = 17661849912. Its totient is φ = 17661849910.

The previous prime is 17661849847. The next prime is 17661850013. The reversal of 17661849911 is 11994816671.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17661849911 - 2⁶ = 17661849847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17661849211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8830924955 + 8830924956.

It is an arithmetic number, because the mean of its divisors is an integer number (8830924956).

Almost surely, 2^17661849911 is an apocalyptic number.

17661849911 is a deficient number, since it is larger than the sum of its proper divisors (1).

17661849911 is an equidigital number, since it uses as much as digits as its factorization.

17661849911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 53.

The spelling of 17661849911 in words is "seventeen billion, six hundred sixty-one million, eight hundred forty-nine thousand, nine hundred eleven".