20228165436217 has 2 divisors, whose sum is σ = 20228165436218. Its totient is φ = 20228165436216.

The previous prime is 20228165436203. The next prime is 20228165436257. The reversal of 20228165436217 is 71263456182202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19287942374416 + 940223061801 = 4391804^2 + 969651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20228165436217 is a prime.

It is not a weakly prime, because it can be changed into another prime (20228165436257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10114082718108 + 10114082718109.

It is an arithmetic number, because the mean of its divisors is an integer number (10114082718109).

Almost surely, 2^{20228165436217} is an apocalyptic number.

It is an amenable number.

20228165436217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20228165436217 is an equidigital number, since it uses as much as digits as its factorization.

20228165436217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 20228165436217 in words is "twenty trillion, two hundred twenty-eight billion, one hundred sixty-five million, four hundred thirty-six thousand, two hundred seventeen".