221164011165 has 16 divisors (see below), whose sum is σ = 355839307200. Its totient is φ = 117295176192.

The previous prime is 221164011151. The next prime is 221164011193. The reversal of 221164011165 is 561110461122.

It is not a de Polignac number, because 221164011165 - 2¹² = 221164007069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41182420 + ... + 41187789.

It is an arithmetic number, because the mean of its divisors is an integer number (22239956700).

Almost surely, 2^221164011165 is an apocalyptic number.

It is an amenable number.

221164011165 is a deficient number, since it is larger than the sum of its proper divisors (134675296035).

221164011165 is a wasteful number, since it uses less digits than its factorization.

221164011165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82370396.

The product of its (nonzero) digits is 2880, while the sum is 30.

Adding to 221164011165 its reverse (561110461122), we get a palindrome (782274472287).

The spelling of 221164011165 in words is "two hundred twenty-one billion, one hundred sixty-four million, eleven thousand, one hundred sixty-five".