20564212661063 has 4 divisors (see below), whose sum is σ = 20564583049440. Its totient is φ = 20563842272688.

The previous prime is 20564212661029. The next prime is 20564212661087. The reversal of 20564212661063 is 36016621246502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20564212661063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564212681063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185110895 + ... + 185221952.

It is an arithmetic number, because the mean of its divisors is an integer number (5141145762360).

Almost surely, 2^{20564212661063} is an apocalyptic number.

20564212661063 is a deficient number, since it is larger than the sum of its proper divisors (370388377).

20564212661063 is an equidigital number, since it uses as much as digits as its factorization.

20564212661063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370388376.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 20564212661063 in words is "twenty trillion, five hundred sixty-four billion, two hundred twelve million, six hundred sixty-one thousand, sixty-three".