20450554066565 has 16 divisors (see below), whose sum is σ = 28052781192192. Its totient is φ = 14020083552384.

The previous prime is 20450554066483. The next prime is 20450554066571. The reversal of 20450554066565 is 56566045505402.

It is not a de Polignac number, because 20450554066565 - 2²⁶ = 20450486957701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65540504 + ... + 65851793.

It is an arithmetic number, because the mean of its divisors is an integer number (1753298824512).

Almost surely, 2^{20450554066565} is an apocalyptic number.

It is an amenable number.

20450554066565 is a deficient number, since it is larger than the sum of its proper divisors (7602227125627).

20450554066565 is a wasteful number, since it uses less digits than its factorization.

20450554066565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131396756.

The product of its (nonzero) digits is 21600000, while the sum is 53.

The spelling of 20450554066565 in words is "twenty trillion, four hundred fifty billion, five hundred fifty-four million, sixty-six thousand, five hundred sixty-five".