206113620305 has 8 divisors (see below), whose sum is σ = 249605485800. Its totient is φ = 163378135296.

The previous prime is 206113620283. The next prime is 206113620343. The reversal of 206113620305 is 503026311602.

It can be written as a sum of positive squares in 4 ways, for example, as 3245353024 + 202868267281 = 56968^2 + 450409^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 206113620305 - 2¹⁴ = 206113603921 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189094520 + ... + 189095609.

It is an arithmetic number, because the mean of its divisors is an integer number (31200685725).

Almost surely, 2^206113620305 is an apocalyptic number.

It is an amenable number.

206113620305 is a deficient number, since it is larger than the sum of its proper divisors (43491865495).

206113620305 is a wasteful number, since it uses less digits than its factorization.

206113620305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378190243.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 206113620305 its reverse (503026311602), we get a palindrome (709139931907).

The spelling of 206113620305 in words is "two hundred six billion, one hundred thirteen million, six hundred twenty thousand, three hundred five".