66868141 has 4 divisors (see below), whose sum is σ = 66992284. Its totient is φ = 66744000.

The previous prime is 66868129. The next prime is 66868159. The reversal of 66868141 is 14186866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14186866 = 2 ⋅7093433.

It can be written as a sum of positive squares in 2 ways, for example, as 51423241 + 15444900 = 7171^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 66868141 - 2²¹ = 64770989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66868094 and 66868103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66868441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61260 + ... + 62341.

It is an arithmetic number, because the mean of its divisors is an integer number (16748071).

Almost surely, 2^66868141 is an apocalyptic number.

It is an amenable number.

66868141 is a deficient number, since it is larger than the sum of its proper divisors (124143).

66868141 is a wasteful number, since it uses less digits than its factorization.

66868141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124142.

The product of its digits is 55296, while the sum is 40.

The square root of 66868141 is about 8177.2942346475. The cubic root of 66868141 is about 405.8881914448. Note that the first 3 decimals are identical.

The spelling of 66868141 in words is "sixty-six million, eight hundred sixty-eight thousand, one hundred forty-one".