166328566 has 4 divisors (see below), whose sum is σ = 249492852. Its totient is φ = 83164282.

The previous prime is 166328563. The next prime is 166328573. The reversal of 166328566 is 665823661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665823661 = 1511 ⋅440651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166328563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41582140 + ... + 41582143.

It is an arithmetic number, because the mean of its divisors is an integer number (62373213).

Almost surely, 2^166328566 is an apocalyptic number.

166328566 is a deficient number, since it is larger than the sum of its proper divisors (83164286).

166328566 is an equidigital number, since it uses as much as digits as its factorization.

166328566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83164285.

The product of its digits is 311040, while the sum is 43.

The square root of 166328566 is about 12896.8432571696. The cubic root of 166328566 is about 549.9488282970.

The spelling of 166328566 in words is "one hundred sixty-six million, three hundred twenty-eight thousand, five hundred sixty-six".