20653586209 has 2 divisors, whose sum is σ = 20653586210. Its totient is φ = 20653586208.

The previous prime is 20653586167. The next prime is 20653586243. The reversal of 20653586209 is 90268535602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17861520609 + 2792065600 = 133647^2 + 52840^2 .

It is a cyclic number.

It is not a de Polignac number, because 20653586209 - 2⁷ = 20653586081 is a prime.

It is not a weakly prime, because it can be changed into another prime (20653586249) 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, 10326793104 + 10326793105.

It is an arithmetic number, because the mean of its divisors is an integer number (10326793105).

Almost surely, 2^20653586209 is an apocalyptic number.

It is an amenable number.

20653586209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20653586209 is an equidigital number, since it uses as much as digits as its factorization.

20653586209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 20653586209 in words is "twenty billion, six hundred fifty-three million, five hundred eighty-six thousand, two hundred nine".