166849985 has 8 divisors (see below), whose sum is σ = 211997736. Its totient is φ = 125628160.

The previous prime is 166849979. The next prime is 166849993. The reversal of 166849985 is 589948661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1547536 + 165302449 = 1244^2 + 12857^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-166849985 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166849985.

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, 981386 + ... + 981555.

It is an arithmetic number, because the mean of its divisors is an integer number (26499717).

Almost surely, 2^166849985 is an apocalyptic number.

It is an amenable number.

166849985 is a deficient number, since it is larger than the sum of its proper divisors (45147751).

166849985 is a wasteful number, since it uses less digits than its factorization.

166849985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962963.

The product of its digits is 3732480, while the sum is 56.

The square root of 166849985 is about 12917.0424246420. The cubic root of 166849985 is about 550.5229021521.

The spelling of 166849985 in words is "one hundred sixty-six million, eight hundred forty-nine thousand, nine hundred eighty-five".