166871583817 has 16 divisors (see below), whose sum is σ = 168517134720. Its totient is φ = 165235352832.

The previous prime is 166871583779. The next prime is 166871583821. The reversal of 166871583817 is 718385178661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166871583817 is a prime.

It is a super-2 number, since 2×166871583817² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166871583017) 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 in 15 ways as a sum of consecutive naturals, for example, 51870193 + ... + 51873409.

It is an arithmetic number, because the mean of its divisors is an integer number (10532320920).

Almost surely, 2^166871583817 is an apocalyptic number.

It is an amenable number.

166871583817 is a deficient number, since it is larger than the sum of its proper divisors (1645550903).

166871583817 is a wasteful number, since it uses less digits than its factorization.

166871583817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512.

The product of its digits is 13547520, while the sum is 61.

The spelling of 166871583817 in words is "one hundred sixty-six billion, eight hundred seventy-one million, five hundred eighty-three thousand, eight hundred seventeen".