202652128561 has 3 divisors (see below), whose sum is σ = 202652578731. Its totient is φ = 202651678392.

The previous prime is 202652128559. The next prime is 202652128577. The reversal of 202652128561 is 165821256202.

The square root of 202652128561 is 450169.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 89352568561 + 113299560000 = 298919^2 + 336600^2 .

It is not a de Polignac number, because 202652128561 - 2¹ = 202652128559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202652128541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 225085 + ... + 675253.

It is an arithmetic number, because the mean of its divisors is an integer number (67550859577).

Almost surely, 2^202652128561 is an apocalyptic number.

202652128561 is the 450169-th square number.

202652128561 is the 225085-th centered octagonal number.

It is an amenable number.

202652128561 is a deficient number, since it is larger than the sum of its proper divisors (450170).

202652128561 is an frugal number, since it uses more digits than its factorization.

202652128561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900338 (or 450169 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 202652128561 in words is "two hundred two billion, six hundred fifty-two million, one hundred twenty-eight thousand, five hundred sixty-one".