206225243136565 has 4 divisors (see below), whose sum is σ = 247470291763884. Its totient is φ = 164980194509248.

The previous prime is 206225243136527. The next prime is 206225243136611. The reversal of 206225243136565 is 565631342522602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44178275262276 + 162046967874289 = 6646674^2 + 12729767^2 .

It is a cyclic number.

It is not a de Polignac number, because 206225243136565 - 2⁴⁷ = 65487754781237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20622524313652 + ... + 20622524313661.

It is an arithmetic number, because the mean of its divisors is an integer number (61867572940971).

Almost surely, 2^{206225243136565} is an apocalyptic number.

It is an amenable number.

206225243136565 is a deficient number, since it is larger than the sum of its proper divisors (41245048627319).

206225243136565 is an equidigital number, since it uses as much as digits as its factorization.

206225243136565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41245048627318.

The product of its (nonzero) digits is 15552000, while the sum is 52.

The spelling of 206225243136565 in words is "two hundred six trillion, two hundred twenty-five billion, two hundred forty-three million, one hundred thirty-six thousand, five hundred sixty-five".