206755121663 has 4 divisors (see below), whose sum is σ = 206847301848. Its totient is φ = 206662941480.

The previous prime is 206755121659. The next prime is 206755121689. The reversal of 206755121663 is 366121557602.

It is a happy number.

206755121663 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 206755121663 - 2² = 206755121659 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 (206755124663) 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 3 ways as a sum of consecutive naturals, for example, 46086728 + ... + 46091213.

It is an arithmetic number, because the mean of its divisors is an integer number (51711825462).

Almost surely, 2^206755121663 is an apocalyptic number.

206755121663 is a deficient number, since it is larger than the sum of its proper divisors (92180185).

206755121663 is an equidigital number, since it uses as much as digits as its factorization.

206755121663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92180184.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 206755121663 in words is "two hundred six billion, seven hundred fifty-five million, one hundred twenty-one thousand, six hundred sixty-three".