20555555513 has 2 divisors, whose sum is σ = 20555555514. Its totient is φ = 20555555512.

The previous prime is 20555555507. The next prime is 20555555519. The reversal of 20555555513 is 31555555502.

It is a balanced prime because it is at equal distance from previous prime (20555555507) and next prime (20555555519).

It can be written as a sum of positive squares in only one way, i.e., 19373020969 + 1182534544 = 139187^2 + 34388^2 .

It is a cyclic number.

It is not a de Polignac number, because 20555555513 - 2⁴ = 20555555497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20555555519) 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, 10277777756 + 10277777757.

It is an arithmetic number, because the mean of its divisors is an integer number (10277777757).

Almost surely, 2^20555555513 is an apocalyptic number.

It is an amenable number.

20555555513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20555555513 is an equidigital number, since it uses as much as digits as its factorization.

20555555513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 468750, while the sum is 41.

The spelling of 20555555513 in words is "twenty billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred thirteen".