166668518287 has 2 divisors, whose sum is σ = 166668518288. Its totient is φ = 166668518286.

The previous prime is 166668518267. The next prime is 166668518411. The reversal of 166668518287 is 782815866661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166668518287 is a prime.

It is a super-3 number, since 3×166668518287³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166668518267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334259143 + 83334259144.

It is an arithmetic number, because the mean of its divisors is an integer number (83334259144).

Almost surely, 2^166668518287 is an apocalyptic number.

166668518287 is a deficient number, since it is larger than the sum of its proper divisors (1).

166668518287 is an equidigital number, since it uses as much as digits as its factorization.

166668518287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46448640, while the sum is 64.

The spelling of 166668518287 in words is "one hundred sixty-six billion, six hundred sixty-eight million, five hundred eighteen thousand, two hundred eighty-seven".