166868641 has 4 divisors (see below), whose sum is σ = 167561284. Its totient is φ = 166176000.

The previous prime is 166868627. The next prime is 166868683. The reversal of 166868641 is 146868661.

166868641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113870241 + 52998400 = 10671^2 + 7280^2 .

It is a cyclic number.

It is not a de Polignac number, because 166868641 - 2¹⁷ = 166737569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166868591 and 166868600.

It is not an unprimeable number, because it can be changed into a prime (166868041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345960 + ... + 346441.

It is an arithmetic number, because the mean of its divisors is an integer number (41890321).

Almost surely, 2^166868641 is an apocalyptic number.

It is an amenable number.

166868641 is a deficient number, since it is larger than the sum of its proper divisors (692643).

166868641 is an equidigital number, since it uses as much as digits as its factorization.

166868641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692642.

The product of its digits is 331776, while the sum is 46.

The square root of 166868641 is about 12917.7645511907. The cubic root of 166868641 is about 550.5434199294.

The spelling of 166868641 in words is "one hundred sixty-six million, eight hundred sixty-eight thousand, six hundred forty-one".