204666566453 has 4 divisors (see below), whose sum is σ = 204669529260. Its totient is φ = 204663603648.

The previous prime is 204666566417. The next prime is 204666566603. The reversal of 204666566453 is 354665666402.

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 72478331524 + 132188234929 = 269218^2 + 363577^2 .

It is a cyclic number.

It is not a de Polignac number, because 204666566453 - 2⁸ = 204666566197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 204666566395 and 204666566404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204666566053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1375250 + ... + 1516787.

It is an arithmetic number, because the mean of its divisors is an integer number (51167382315).

Almost surely, 2^204666566453 is an apocalyptic number.

It is an amenable number.

204666566453 is a deficient number, since it is larger than the sum of its proper divisors (2962807).

204666566453 is an equidigital number, since it uses as much as digits as its factorization.

204666566453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2962806.

The product of its (nonzero) digits is 18662400, while the sum is 53.

The spelling of 204666566453 in words is "two hundred four billion, six hundred sixty-six million, five hundred sixty-six thousand, four hundred fifty-three".