2066864881 has 4 divisors (see below), whose sum is σ = 2122726132. Its totient is φ = 2011003632.

The previous prime is 2066864857. The next prime is 2066864911. The reversal of 2066864881 is 1884686602.

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 1538600625 + 528264256 = 39225^2 + 22984^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066864881 - 2²¹ = 2064767729 is a prime.

It is a super-2 number, since 2×2066864881² = 8543860872622288322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2066862881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27930570 + ... + 27930643.

It is an arithmetic number, because the mean of its divisors is an integer number (530681533).

Almost surely, 2^2066864881 is an apocalyptic number.

It is an amenable number.

2066864881 is a deficient number, since it is larger than the sum of its proper divisors (55861251).

2066864881 is an equidigital number, since it uses as much as digits as its factorization.

2066864881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55861250.

The product of its (nonzero) digits is 884736, while the sum is 49.

The square root of 2066864881 is about 45462.7856713598. The cubic root of 2066864881 is about 1273.8081659672.

The spelling of 2066864881 in words is "two billion, sixty-six million, eight hundred sixty-four thousand, eight hundred eighty-one".