166322818 has 4 divisors (see below), whose sum is σ = 249484230. Its totient is φ = 83161408.

The previous prime is 166322771. The next prime is 166322837. The reversal of 166322818 is 818223661.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 113571649 + 52751169 = 10657^2 + 7263^2 .

It is a super-2 number, since 2×166322818² = 55326559574922248, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 41580703 + ... + 41580706.

Almost surely, 2^166322818 is an apocalyptic number.

166322818 is a deficient number, since it is larger than the sum of its proper divisors (83161412).

166322818 is an equidigital number, since it uses as much as digits as its factorization.

166322818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83161411.

The product of its digits is 27648, while the sum is 37.

The square root of 166322818 is about 12896.6204100144. The cubic root of 166322818 is about 549.9424931610.

The spelling of 166322818 in words is "one hundred sixty-six million, three hundred twenty-two thousand, eight hundred eighteen".