20311330266697 has 2 divisors, whose sum is σ = 20311330266698. Its totient is φ = 20311330266696.

The previous prime is 20311330266691. The next prime is 20311330266727. The reversal of 20311330266697 is 79666203311302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17534494631241 + 2776835635456 = 4187421^2 + 1666384^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311330266697 - 2³⁵ = 20276970528329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20311330266697.

It is not a weakly prime, because it can be changed into another prime (20311330266691) 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 as a sum of consecutive naturals, namely, 10155665133348 + 10155665133349.

It is an arithmetic number, because the mean of its divisors is an integer number (10155665133349).

Almost surely, 2^{20311330266697} is an apocalyptic number.

It is an amenable number.

20311330266697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311330266697 is an equidigital number, since it uses as much as digits as its factorization.

20311330266697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 49.

Adding to 20311330266697 its reverse (79666203311302), we get a palindrome (99977533577999).

The spelling of 20311330266697 in words is "twenty trillion, three hundred eleven billion, three hundred thirty million, two hundred sixty-six thousand, six hundred ninety-seven".