200166561 has 24 divisors (see below), whose sum is σ = 337469184. Its totient is φ = 111945600.

The previous prime is 200166529. The next prime is 200166569. The reversal of 200166561 is 165661002.

It is a happy number.

200166561 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 6 + 656 + 1 = 666.

It is not a de Polignac number, because 200166561 - 2⁵ = 200166529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (200166569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30840 + ... + 36761.

It is an arithmetic number, because the mean of its divisors is an integer number (14061216).

Almost surely, 2^200166561 is an apocalyptic number.

200166561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

200166561 is a deficient number, since it is larger than the sum of its proper divisors (137302623).

200166561 is a wasteful number, since it uses less digits than its factorization.

200166561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67661 (or 67658 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 200166561 is about 14148.0232188105. The cubic root of 200166561 is about 584.9658450364.

The spelling of 200166561 in words is "two hundred million, one hundred sixty-six thousand, five hundred sixty-one".