166205266 has 8 divisors (see below), whose sum is σ = 249443964. Its totient is φ = 83057280.

The previous prime is 166205261. The next prime is 166205287. The reversal of 166205266 is 662502661.

It can be written as a sum of positive squares in 2 ways, for example, as 163712025 + 2493241 = 12795^2 + 1579^2 .

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

It is a super-2 number, since 2×166205266² = 55248380892261512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166205261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17895 + ... + 25546.

Almost surely, 2^166205266 is an apocalyptic number.

166205266 is a deficient number, since it is larger than the sum of its proper divisors (83238698).

166205266 is a wasteful number, since it uses less digits than its factorization.

166205266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45356.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 166205266 is about 12892.0621314047. The cubic root of 166205266 is about 549.8129016496.

The spelling of 166205266 in words is "one hundred sixty-six million, two hundred five thousand, two hundred sixty-six".