166081618 has 8 divisors (see below), whose sum is σ = 250499340. Its totient is φ = 82581840.

The previous prime is 166081577. The next prime is 166081649. The reversal of 166081618 is 816180661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 127306089 + 38775529 = 11283^2 + 6227^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 229033 + ... + 229756.

Almost surely, 2^166081618 is an apocalyptic number.

166081618 is a deficient number, since it is larger than the sum of its proper divisors (84417722).

166081618 is a wasteful number, since it uses less digits than its factorization.

166081618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458972.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 166081618 is about 12887.2657301695. The cubic root of 166081618 is about 549.6765238381.

The spelling of 166081618 in words is "one hundred sixty-six million, eighty-one thousand, six hundred eighteen".