20016566473 has 2 divisors, whose sum is σ = 20016566474. Its totient is φ = 20016566472.

The previous prime is 20016566429. The next prime is 20016566509. The reversal of 20016566473 is 37466561002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19670904009 + 345662464 = 140253^2 + 18592^2 .

It is a cyclic number.

It is not a de Polignac number, because 20016566473 - 2¹⁷ = 20016435401 is a prime.

It is not a weakly prime, because it can be changed into another prime (20016561473) 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, 10008283236 + 10008283237.

It is an arithmetic number, because the mean of its divisors is an integer number (10008283237).

Almost surely, 2^20016566473 is an apocalyptic number.

It is an amenable number.

20016566473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20016566473 is an equidigital number, since it uses as much as digits as its factorization.

20016566473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 20016566473 in words is "twenty billion, sixteen million, five hundred sixty-six thousand, four hundred seventy-three".