166449681 has 8 divisors (see below), whose sum is σ = 246592160. Its totient is φ = 110966436.

The previous prime is 166449677. The next prime is 166449683. The reversal of 166449681 is 186944661.

166449681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166449681 - 2² = 166449677 is a prime.

It is a super-2 number, since 2×166449681² = 55410992610003522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166449683) 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, 3082375 + ... + 3082428.

It is an arithmetic number, because the mean of its divisors is an integer number (30824020).

Almost surely, 2^166449681 is an apocalyptic number.

It is an amenable number.

166449681 is a deficient number, since it is larger than the sum of its proper divisors (80142479).

166449681 is an equidigital number, since it uses as much as digits as its factorization.

166449681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6164812 (or 6164806 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 166449681 is about 12901.5379315801. The cubic root of 166449681 is about 550.0822808030.

The spelling of 166449681 in words is "one hundred sixty-six million, four hundred forty-nine thousand, six hundred eighty-one".