871666573 has 2 divisors, whose sum is σ = 871666574. Its totient is φ = 871666572.

The previous prime is 871666571. The next prime is 871666603. The reversal of 871666573 is 375666178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 546297129 + 325369444 = 23373^2 + 18038^2 .

It is a cyclic number.

It is not a de Polignac number, because 871666573 - 2¹ = 871666571 is a prime.

It is a super-2 number, since 2×871666573² = 1519605228971128658, which contains 22 as substring.

Together with 871666571, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871666571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435833286 + 435833287.

It is an arithmetic number, because the mean of its divisors is an integer number (435833287).

Almost surely, 2^871666573 is an apocalyptic number.

It is an amenable number.

871666573 is a deficient number, since it is larger than the sum of its proper divisors (1).

871666573 is an equidigital number, since it uses as much as digits as its factorization.

871666573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 49.

The square root of 871666573 is about 29523.9999491939. Note that the first 4 decimals coincide. The cubic root of 871666573 is about 955.2494521188.

It can be divided in two parts, 87166 and 6573, that added together give a palindrome (93739).

The spelling of 871666573 in words is "eight hundred seventy-one million, six hundred sixty-six thousand, five hundred seventy-three".