206666651411 has 4 divisors (see below), whose sum is σ = 225454528824. Its totient is φ = 187878774000.

The previous prime is 206666651377. The next prime is 206666651441. The reversal of 206666651411 is 114156666602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206666651411 is a prime.

It is a super-2 number, since 2×206666651411² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206666651441) 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, 9393938690 + ... + 9393938711.

It is an arithmetic number, because the mean of its divisors is an integer number (56363632206).

Almost surely, 2^206666651411 is an apocalyptic number.

206666651411 is a deficient number, since it is larger than the sum of its proper divisors (18787877413).

206666651411 is a wasteful number, since it uses less digits than its factorization.

206666651411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18787877412.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 206666651411 in words is "two hundred six billion, six hundred sixty-six million, six hundred fifty-one thousand, four hundred eleven".