206225243136661 has 8 divisors (see below), whose sum is σ = 235806918796800. Its totient is φ = 176673799136688.

The previous prime is 206225243136629. The next prime is 206225243136677. The reversal of 206225243136661 is 166631342522602.

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

It is not a de Polignac number, because 206225243136661 - 2⁵ = 206225243136629 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 (206225243136611) 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, 7557900421 + ... + 7557927706.

It is an arithmetic number, because the mean of its divisors is an integer number (29475864849600).

Almost surely, 2^{206225243136661} is an apocalyptic number.

It is an amenable number.

206225243136661 is a deficient number, since it is larger than the sum of its proper divisors (29581675660139).

206225243136661 is a wasteful number, since it uses less digits than its factorization.

206225243136661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15115830083.

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 206225243136661 in words is "two hundred six trillion, two hundred twenty-five billion, two hundred forty-three million, one hundred thirty-six thousand, six hundred sixty-one".