17664897871 has 2 divisors, whose sum is σ = 17664897872. Its totient is φ = 17664897870.

The previous prime is 17664897857. The next prime is 17664897881. The reversal of 17664897871 is 17879846671.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17664897871 - 2⁵ = 17664897839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17664897841) 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, 8832448935 + 8832448936.

It is an arithmetic number, because the mean of its divisors is an integer number (8832448936).

Almost surely, 2^17664897871 is an apocalyptic number.

17664897871 is a deficient number, since it is larger than the sum of its proper divisors (1).

17664897871 is an equidigital number, since it uses as much as digits as its factorization.

17664897871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28449792, while the sum is 64.

The spelling of 17664897871 in words is "seventeen billion, six hundred sixty-four million, eight hundred ninety-seven thousand, eight hundred seventy-one".