205216020425566 has 16 divisors (see below), whose sum is σ = 312072672162384. Its totient is φ = 101196081437184.

The previous prime is 205216020425443. The next prime is 205216020425597. The reversal of 205216020425566 is 665524020612502.

It is a super-2 number, since 2×205216020425566² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071170325 + ... + 1071361888.

It is an arithmetic number, because the mean of its divisors is an integer number (19504542010149).

Almost surely, 2^{205216020425566} is an apocalyptic number.

205216020425566 is a deficient number, since it is larger than the sum of its proper divisors (106856651736818).

205216020425566 is a wasteful number, since it uses less digits than its factorization.

205216020425566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142532875.

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 205216020425566 in words is "two hundred five trillion, two hundred sixteen billion, twenty million, four hundred twenty-five thousand, five hundred sixty-six".