20165330111 has 4 divisors (see below), whose sum is σ = 20165773152. Its totient is φ = 20164887072.

The previous prime is 20165330099. The next prime is 20165330197. The reversal of 20165330111 is 11103356102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11103356102 = 2 ⋅5551678051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20165330111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164330111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144266 + ... + 247271.

It is an arithmetic number, because the mean of its divisors is an integer number (5041443288).

Almost surely, 2^20165330111 is an apocalyptic number.

20165330111 is a deficient number, since it is larger than the sum of its proper divisors (443041).

20165330111 is an equidigital number, since it uses as much as digits as its factorization.

20165330111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443040.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 20165330111 its reverse (11103356102), we get a palindrome (31268686213).

The spelling of 20165330111 in words is "twenty billion, one hundred sixty-five million, three hundred thirty thousand, one hundred eleven".