203553466561 has 9 divisors (see below), whose sum is σ = 206198813793. Its totient is φ = 200941649220.

The previous prime is 203553466553. The next prime is 203553466603. The reversal of 203553466561 is 165664355302.

The square root of 203553466561 is 451169.

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

It is not a de Polignac number, because 203553466561 - 2³ = 203553466553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (203553466531) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35639496 + ... + 35645206.

Almost surely, 2^203553466561 is an apocalyptic number.

203553466561 is the 451169-th square number.

203553466561 is the 225585-th centered octagonal number.

It is an amenable number.

203553466561 is a deficient number, since it is larger than the sum of its proper divisors (2645347232).

203553466561 is an frugal number, since it uses more digits than its factorization.

203553466561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11580 (or 5790 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 46.

The spelling of 203553466561 in words is "two hundred three billion, five hundred fifty-three million, four hundred sixty-six thousand, five hundred sixty-one".