20564224966655 has 16 divisors (see below), whose sum is σ = 24772493152800. Its totient is φ = 16387800468480.

The previous prime is 20564224966643. The next prime is 20564224966673. The reversal of 20564224966655 is 55666942246502.

It is not a de Polignac number, because 20564224966655 - 2¹⁴ = 20564224950271 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2333351 + ... + 6824439.

It is an arithmetic number, because the mean of its divisors is an integer number (1548280822050).

Almost surely, 2^{20564224966655} is an apocalyptic number.

20564224966655 is a deficient number, since it is larger than the sum of its proper divisors (4208268186145).

20564224966655 is a wasteful number, since it uses less digits than its factorization.

20564224966655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4494634.

The product of its (nonzero) digits is 186624000, while the sum is 62.

The spelling of 20564224966655 in words is "twenty trillion, five hundred sixty-four billion, two hundred twenty-four million, nine hundred sixty-six thousand, six hundred fifty-five".