20556550199 has 2 divisors, whose sum is σ = 20556550200. Its totient is φ = 20556550198.

The previous prime is 20556550181. The next prime is 20556550253. The reversal of 20556550199 is 99105565502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20556550199 - 2²⁰ = 20555501623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20556550159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10278275099 + 10278275100.

It is an arithmetic number, because the mean of its divisors is an integer number (10278275100).

Almost surely, 2^20556550199 is an apocalyptic number.

20556550199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20556550199 is an equidigital number, since it uses as much as digits as its factorization.

20556550199 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 47.

The spelling of 20556550199 in words is "twenty billion, five hundred fifty-six million, five hundred fifty thousand, one hundred ninety-nine".