166668571 has 2 divisors, whose sum is σ = 166668572. Its totient is φ = 166668570.

The previous prime is 166668553. The next prime is 166668581. The reversal of 166668571 is 175866661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166668571 - 2¹³ = 166660379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166668581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334285 + 83334286.

It is an arithmetic number, because the mean of its divisors is an integer number (83334286).

Almost surely, 2^166668571 is an apocalyptic number.

166668571 is a deficient number, since it is larger than the sum of its proper divisors (1).

166668571 is an equidigital number, since it uses as much as digits as its factorization.

166668571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 166668571 is about 12910.0182416602. The cubic root of 166668571 is about 550.3233041312.

The spelling of 166668571 in words is "one hundred sixty-six million, six hundred sixty-eight thousand, five hundred seventy-one".