20650955917 has 2 divisors, whose sum is σ = 20650955918. Its totient is φ = 20650955916.

The previous prime is 20650955893. The next prime is 20650955933. The reversal of 20650955917 is 71955905602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15112768356 + 5538187561 = 122934^2 + 74419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20650955917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20650955947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10325477958 + 10325477959.

It is an arithmetic number, because the mean of its divisors is an integer number (10325477959).

Almost surely, 2^20650955917 is an apocalyptic number.

It is an amenable number.

20650955917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20650955917 is an equidigital number, since it uses as much as digits as its factorization.

20650955917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 850500, while the sum is 49.

The spelling of 20650955917 in words is "twenty billion, six hundred fifty million, nine hundred fifty-five thousand, nine hundred seventeen".