206400563 has 4 divisors (see below), whose sum is σ = 207223128. Its totient is φ = 205578000.

The previous prime is 206400533. The next prime is 206400583. The reversal of 206400563 is 365004602.

206400563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 206400563 - 2¹⁸ = 206138419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206400503) 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, 410906 + ... + 411407.

It is an arithmetic number, because the mean of its divisors is an integer number (51805782).

Almost surely, 2^206400563 is an apocalyptic number.

206400563 is a deficient number, since it is larger than the sum of its proper divisors (822565).

206400563 is an equidigital number, since it uses as much as digits as its factorization.

206400563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822564.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 206400563 is about 14366.6475908613. The cubic root of 206400563 is about 590.9766100742.

The spelling of 206400563 in words is "two hundred six million, four hundred thousand, five hundred sixty-three".