2066351218321 has 4 divisors (see below), whose sum is σ = 2225301312052. Its totient is φ = 1907401124592.

The previous prime is 2066351218319. The next prime is 2066351218331. The reversal of 2066351218321 is 1238121536602.

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 205309578321 + 1861041640000 = 453111^2 + 1364200^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066351218321 - 2¹ = 2066351218319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2066351218331) 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, 79475046846 + ... + 79475046871.

It is an arithmetic number, because the mean of its divisors is an integer number (556325328013).

Almost surely, 2^{2066351218321} is an apocalyptic number.

It is an amenable number.

2066351218321 is a deficient number, since it is larger than the sum of its proper divisors (158950093731).

2066351218321 is a wasteful number, since it uses less digits than its factorization.

2066351218321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158950093730.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 2066351218321 in words is "two trillion, sixty-six billion, three hundred fifty-one million, two hundred eighteen thousand, three hundred twenty-one".