20550456149 has 2 divisors, whose sum is σ = 20550456150. Its totient is φ = 20550456148.

The previous prime is 20550456133. The next prime is 20550456167. The reversal of 20550456149 is 94165405502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15545601124 + 5004855025 = 124682^2 + 70745^2 .

It is a cyclic number.

It is not a de Polignac number, because 20550456149 - 2⁴ = 20550456133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20550450149) 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, 10275228074 + 10275228075.

It is an arithmetic number, because the mean of its divisors is an integer number (10275228075).

Almost surely, 2^20550456149 is an apocalyptic number.

It is an amenable number.

20550456149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20550456149 is an equidigital number, since it uses as much as digits as its factorization.

20550456149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 20550456149 in words is "twenty billion, five hundred fifty million, four hundred fifty-six thousand, one hundred forty-nine".