2165111766201 has 8 divisors (see below), whose sum is σ = 2886823527840. Its totient is φ = 1443403924352.

The previous prime is 2165111766119. The next prime is 2165111766217. The reversal of 2165111766201 is 1026671115612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2165111766201 - 2⁹ = 2165111765689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2165111766201.

It is not an unprimeable number, because it can be changed into a prime (2165111766001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740266 + ... + 2208668.

It is an arithmetic number, because the mean of its divisors is an integer number (360852940980).

Almost surely, 2^{2165111766201} is an apocalyptic number.

It is an amenable number.

2165111766201 is a deficient number, since it is larger than the sum of its proper divisors (721711761639).

2165111766201 is a wasteful number, since it uses less digits than its factorization.

2165111766201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959895.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 2165111766201 in words is "two trillion, one hundred sixty-five billion, one hundred eleven million, seven hundred sixty-six thousand, two hundred one".