166668518517 has 8 divisors (see below), whose sum is σ = 235296732096. Its totient is φ = 104576325312.

The previous prime is 166668518503. The next prime is 166668518519. The reversal of 166668518517 is 715815866661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166668518517 - 2¹⁵ = 166668485749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166668518519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1634005033 + ... + 1634005134.

It is an arithmetic number, because the mean of its divisors is an integer number (29412091512).

Almost surely, 2^166668518517 is an apocalyptic number.

166668518517 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

166668518517 is a deficient number, since it is larger than the sum of its proper divisors (68628213579).

166668518517 is a wasteful number, since it uses less digits than its factorization.

166668518517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3268010187.

The product of its digits is 14515200, while the sum is 60.

The spelling of 166668518517 in words is "one hundred sixty-six billion, six hundred sixty-eight million, five hundred eighteen thousand, five hundred seventeen".