200805592606921 has 9 divisors (see below), whose sum is σ = 207969119020533. Its totient is φ = 193880865050880.

The previous prime is 200805592606901. The next prime is 200805592606933. The reversal of 200805592606921 is 129606295508002.

The square root of 200805592606921 is 14170589.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 68465877396921 + 132339715210000 = 8274411^2 + 11503900^2 .

It is a de Polignac number, because none of the positive numbers 2^k-200805592606921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200805592606901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 410702761 + ... + 411191401.

Almost surely, 2^{200805592606921} is an apocalyptic number.

200805592606921 is the 14170589-th square number.

200805592606921 is the 7085295-th centered octagonal number.

It is an amenable number.

200805592606921 is a deficient number, since it is larger than the sum of its proper divisors (7163526413612).

200805592606921 is an frugal number, since it uses more digits than its factorization.

200805592606921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977340 (or 488670 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 200805592606921 in words is "two hundred trillion, eight hundred five billion, five hundred ninety-two million, six hundred six thousand, nine hundred twenty-one".