4066067681 has 4 divisors (see below), whose sum is σ = 4378842132. Its totient is φ = 3753293232.

The previous prime is 4066067671. The next prime is 4066067729. The reversal of 4066067681 is 1867606604.

4066067681 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 2367309025 + 1698758656 = 48655^2 + 41216^2 .

It is not a de Polignac number, because 4066067681 - 2³⁰ = 2992325857 is a prime.

It is a super-2 number, since 2×4066067681² = 33065812772945435522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4066067611) 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, 156387206 + ... + 156387231.

It is an arithmetic number, because the mean of its divisors is an integer number (1094710533).

Almost surely, 2^4066067681 is an apocalyptic number.

It is an amenable number.

4066067681 is a deficient number, since it is larger than the sum of its proper divisors (312774451).

4066067681 is a wasteful number, since it uses less digits than its factorization.

4066067681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312774450.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 4066067681 is about 63765.7249703946. The cubic root of 4066067681 is about 1596.0930301371.

The spelling of 4066067681 in words is "four billion, sixty-six million, sixty-seven thousand, six hundred eighty-one".