166655985 has 8 divisors (see below), whose sum is σ = 266649600. Its totient is φ = 88883184.

The previous prime is 166655963. The next prime is 166656023. The reversal of 166655985 is 589556661.

It is a happy number.

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

It is not a de Polignac number, because 166655985 - 2⁸ = 166655729 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5555185 + ... + 5555214.

It is an arithmetic number, because the mean of its divisors is an integer number (33331200).

Almost surely, 2^166655985 is an apocalyptic number.

166655985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166655985 is a deficient number, since it is larger than the sum of its proper divisors (99993615).

166655985 is a wasteful number, since it uses less digits than its factorization.

166655985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11110407.

The product of its digits is 1944000, while the sum is 51.

The square root of 166655985 is about 12909.5307815583. The cubic root of 166655985 is about 550.3094512025.

The spelling of 166655985 in words is "one hundred sixty-six million, six hundred fifty-five thousand, nine hundred eighty-five".