20565355319 has 2 divisors, whose sum is σ = 20565355320. Its totient is φ = 20565355318.

The previous prime is 20565355303. The next prime is 20565355357. The reversal of 20565355319 is 91355356502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20565355319 - 2⁴ = 20565355303 is a prime.

It is a super-2 number, since 2×20565355319² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20565355319.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20565355519) 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, 10282677659 + 10282677660.

It is an arithmetic number, because the mean of its divisors is an integer number (10282677660).

Almost surely, 2^20565355319 is an apocalyptic number.

20565355319 is a deficient number, since it is larger than the sum of its proper divisors (1).

20565355319 is an equidigital number, since it uses as much as digits as its factorization.

20565355319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 607500, while the sum is 44.

The spelling of 20565355319 in words is "twenty billion, five hundred sixty-five million, three hundred fifty-five thousand, three hundred nineteen".