166428571 has 4 divisors (see below), whose sum is σ = 167217544. Its totient is φ = 165639600.

The previous prime is 166428527. The next prime is 166428583. The reversal of 166428571 is 175824661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166428571 - 2²⁵ = 132874139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166428971) 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, 394170 + ... + 394591.

It is an arithmetic number, because the mean of its divisors is an integer number (41804386).

Almost surely, 2^166428571 is an apocalyptic number.

166428571 is a deficient number, since it is larger than the sum of its proper divisors (788973).

166428571 is an equidigital number, since it uses as much as digits as its factorization.

166428571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788972.

The product of its digits is 80640, while the sum is 40.

The square root of 166428571 is about 12900.7197861205. The cubic root of 166428571 is about 550.0590250703.

The spelling of 166428571 in words is "one hundred sixty-six million, four hundred twenty-eight thousand, five hundred seventy-one".