2066566385791 has 4 divisors (see below), whose sum is σ = 2080435959000. Its totient is φ = 2052696812584.

The previous prime is 2066566385783. The next prime is 2066566385827. The reversal of 2066566385791 is 1975836656602.

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

It is a cyclic number.

It is not a de Polignac number, because 2066566385791 - 2³ = 2066566385783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066566385761) 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, 6934786381 + ... + 6934786678.

It is an arithmetic number, because the mean of its divisors is an integer number (520108989750).

Almost surely, 2^{2066566385791} is an apocalyptic number.

2066566385791 is a deficient number, since it is larger than the sum of its proper divisors (13869573209).

2066566385791 is a wasteful number, since it uses less digits than its factorization.

2066566385791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13869573208.

The product of its (nonzero) digits is 97977600, while the sum is 64.

The spelling of 2066566385791 in words is "two trillion, sixty-six billion, five hundred sixty-six million, three hundred eighty-five thousand, seven hundred ninety-one".