20566507013263 has 8 divisors (see below), whose sum is σ = 21122466156368. Its totient is φ = 20010553533504.

The previous prime is 20566507013251. The next prime is 20566507013267. The reversal of 20566507013263 is 36231070566502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20566507013263 - 2¹⁷ = 20566506882191 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 (20566507013267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6541795 + ... + 9161227.

It is an arithmetic number, because the mean of its divisors is an integer number (2640308269546).

Almost surely, 2^{20566507013263} is an apocalyptic number.

20566507013263 is a deficient number, since it is larger than the sum of its proper divisors (555959143105).

20566507013263 is a wasteful number, since it uses less digits than its factorization.

20566507013263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831673.

The product of its (nonzero) digits is 1360800, while the sum is 46.

Adding to 20566507013263 its reverse (36231070566502), we get a palindrome (56797577579765).

The spelling of 20566507013263 in words is "twenty trillion, five hundred sixty-six billion, five hundred seven million, thirteen thousand, two hundred sixty-three".