2066740681 has 4 divisors (see below), whose sum is σ = 2066956164. Its totient is φ = 2066525200.

The previous prime is 2066740673. The next prime is 2066740699. The reversal of 2066740681 is 1860476602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1860476602 = 2 ⋅930238301.

It can be written as a sum of positive squares in 2 ways, for example, as 1506992400 + 559748281 = 38820^2 + 23659^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066740681 - 2³ = 2066740673 is a prime.

It is a super-2 number, since 2×2066740681² = 8542834085000687522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2066750681) 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, 92650 + ... + 112771.

It is an arithmetic number, because the mean of its divisors is an integer number (516739041).

Almost surely, 2^2066740681 is an apocalyptic number.

It is an amenable number.

2066740681 is a deficient number, since it is larger than the sum of its proper divisors (215483).

2066740681 is a wasteful number, since it uses less digits than its factorization.

2066740681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215482.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 2066740681 is about 45461.4196984652. The cubic root of 2066740681 is about 1273.7826506494.

The spelling of 2066740681 in words is "two billion, sixty-six million, seven hundred forty thousand, six hundred eighty-one".