166668518266 has 8 divisors (see below), whose sum is σ = 250418757204. Its totient is φ = 83195599200.

The previous prime is 166668518243. The next prime is 166668518267. The reversal of 166668518266 is 662815866661.

It can be written as a sum of positive squares in 2 ways, for example, as 145488082041 + 21180436225 = 381429^2 + 145535^2 .

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

It is not an unprimeable number, because it can be changed into a prime (166668518267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69328465 + ... + 69330868.

Almost surely, 2^166668518266 is an apocalyptic number.

166668518266 is a deficient number, since it is larger than the sum of its proper divisors (83750238938).

166668518266 is a wasteful number, since it uses less digits than its factorization.

166668518266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138659936.

The product of its digits is 29859840, while the sum is 61.

The spelling of 166668518266 in words is "one hundred sixty-six billion, six hundred sixty-eight million, five hundred eighteen thousand, two hundred sixty-six".