166285681 has 8 divisors (see below), whose sum is σ = 172166400. Its totient is φ = 160414800.

The previous prime is 166285673. The next prime is 166285703. The reversal of 166285681 is 186582661.

166285681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 166285681 - 2³ = 166285673 is a prime.

It is a super-2 number, since 2×166285681² = 55301855411267522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166285631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55110 + ... + 58048.

It is an arithmetic number, because the mean of its divisors is an integer number (21520800).

Almost surely, 2^166285681 is an apocalyptic number.

It is an amenable number.

166285681 is a deficient number, since it is larger than the sum of its proper divisors (5880719).

166285681 is a wasteful number, since it uses less digits than its factorization.

166285681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4919.

The product of its digits is 138240, while the sum is 43.

The square root of 166285681 is about 12895.1805338274. The cubic root of 166285681 is about 549.9015592413.

The spelling of 166285681 in words is "one hundred sixty-six million, two hundred eighty-five thousand, six hundred eighty-one".