206163245125505 has 8 divisors (see below), whose sum is σ = 261948593806632. Its totient is φ = 155228796329728.

The previous prime is 206163245125499. The next prime is 206163245125529. The reversal of 206163245125505 is 505521542361602.

It can be written as a sum of positive squares in 4 ways, for example, as 99040393225216 + 107122851900289 = 9951904^2 + 10350017^2 .

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 206163245125505 - 2¹⁰ = 206163245124481 is a prime.

It is a super-2 number, since 2×206163245125505² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206163245125505.

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, 1212724971242 + ... + 1212724971411.

It is an arithmetic number, because the mean of its divisors is an integer number (32743574225829).

Almost surely, 2^{206163245125505} is an apocalyptic number.

It is an amenable number.

206163245125505 is a deficient number, since it is larger than the sum of its proper divisors (55785348681127).

206163245125505 is a wasteful number, since it uses less digits than its factorization.

206163245125505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425449942675.

The product of its (nonzero) digits is 2160000, while the sum is 47.

The spelling of 206163245125505 in words is "two hundred six trillion, one hundred sixty-three billion, two hundred forty-five million, one hundred twenty-five thousand, five hundred five".