206235506661 has 8 divisors (see below), whose sum is σ = 274984638240. Its totient is φ = 137488356432.

The previous prime is 206235506623. The next prime is 206235506747. The reversal of 206235506661 is 166605532602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-206235506661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206235506261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232546 + ... + 683043.

It is an arithmetic number, because the mean of its divisors is an integer number (34373079780).

Almost surely, 2^206235506661 is an apocalyptic number.

It is an amenable number.

206235506661 is a deficient number, since it is larger than the sum of its proper divisors (68749131579).

206235506661 is an equidigital number, since it uses as much as digits as its factorization.

206235506661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990675.

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 206235506661 in words is "two hundred six billion, two hundred thirty-five million, five hundred six thousand, six hundred sixty-one".