20565500629 has 2 divisors, whose sum is σ = 20565500630. Its totient is φ = 20565500628.

The previous prime is 20565500609. The next prime is 20565500689. The reversal of 20565500629 is 92600556502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17910468900 + 2655031729 = 133830^2 + 51527^2 .

It is a cyclic number.

It is not a de Polignac number, because 20565500629 - 2¹⁵ = 20565467861 is a prime.

It is a super-2 number, since 2×20565500629² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20565500591 and 20565500600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20565500609) 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, 10282750314 + 10282750315.

It is an arithmetic number, because the mean of its divisors is an integer number (10282750315).

Almost surely, 2^20565500629 is an apocalyptic number.

It is an amenable number.

20565500629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20565500629 is an equidigital number, since it uses as much as digits as its factorization.

20565500629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 20565500629 in words is "twenty billion, five hundred sixty-five million, five hundred thousand, six hundred twenty-nine".