206564451040505 has 32 divisors (see below), whose sum is σ = 257972410396800. Its totient is φ = 158591091162112.

The previous prime is 206564451040477. The next prime is 206564451040637. The reversal of 206564451040505 is 505040154465602.

It is a cyclic number.

It is not a de Polignac number, because 206564451040505 - 2⁸ = 206564451040249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206564451040505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56442977 + ... + 59991153.

It is an arithmetic number, because the mean of its divisors is an integer number (8061637824900).

Almost surely, 2^{206564451040505} is an apocalyptic number.

It is an amenable number.

206564451040505 is a deficient number, since it is larger than the sum of its proper divisors (51407959356295).

206564451040505 is a wasteful number, since it uses less digits than its factorization.

206564451040505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550633.

The product of its (nonzero) digits is 2880000, while the sum is 47.

The spelling of 206564451040505 in words is "two hundred six trillion, five hundred sixty-four billion, four hundred fifty-one million, forty thousand, five hundred five".