2166706651009 has 4 divisors (see below), whose sum is σ = 2187742638016. Its totient is φ = 2145670664004.

The previous prime is 2166706650967. The next prime is 2166706651033. The reversal of 2166706651009 is 9001566076612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2166706651009 - 2¹¹ = 2166706648961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166706651049) 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, 10517993349 + ... + 10517993554.

It is an arithmetic number, because the mean of its divisors is an integer number (546935659504).

Almost surely, 2^{2166706651009} is an apocalyptic number.

It is an amenable number.

2166706651009 is a deficient number, since it is larger than the sum of its proper divisors (21035987007).

2166706651009 is a wasteful number, since it uses less digits than its factorization.

2166706651009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21035987006.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 2166706651009 in words is "two trillion, one hundred sixty-six billion, seven hundred six million, six hundred fifty-one thousand, nine".