20665786315911 has 16 divisors (see below), whose sum is σ = 30369215509248. Its totient is φ = 12395598163200.

The previous prime is 20665786315901. The next prime is 20665786315961. The reversal of 20665786315911 is 11951368756602.

It is a happy number.

It is not a de Polignac number, because 20665786315911 - 2⁵ = 20665786315879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665786315901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3228017155 + ... + 3228023556.

It is an arithmetic number, because the mean of its divisors is an integer number (1898075969328).

Almost surely, 2^{20665786315911} is an apocalyptic number.

20665786315911 is a deficient number, since it is larger than the sum of its proper divisors (9703429193337).

20665786315911 is a wasteful number, since it uses less digits than its factorization.

20665786315911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6456040822.

The product of its (nonzero) digits is 16329600, while the sum is 60.

It can be divided in two parts, 206657 and 86315911, that added together give a palindrome (86522568).

The spelling of 20665786315911 in words is "twenty trillion, six hundred sixty-five billion, seven hundred eighty-six million, three hundred fifteen thousand, nine hundred eleven".