206511354655 has 32 divisors (see below), whose sum is σ = 257255409600. Its totient is φ = 158955374592.

The previous prime is 206511354653. The next prime is 206511354827. The reversal of 206511354655 is 556453115602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 206511354655 - 2¹ = 206511354653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206511354653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77663716 + ... + 77666374.

It is an arithmetic number, because the mean of its divisors is an integer number (8039231550).

Almost surely, 2^206511354655 is an apocalyptic number.

206511354655 is a deficient number, since it is larger than the sum of its proper divisors (50744054945).

206511354655 is a wasteful number, since it uses less digits than its factorization.

206511354655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363.

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 206511354655 in words is "two hundred six billion, five hundred eleven million, three hundred fifty-four thousand, six hundred fifty-five".