2505320561 has 4 divisors (see below), whose sum is σ = 2515716324. Its totient is φ = 2494924800.

The previous prime is 2505320537. The next prime is 2505320591. The reversal of 2505320561 is 1650235052.

It is a happy number.

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 667912336 + 1837408225 = 25844^2 + 42865^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505320561 - 2⁶ = 2505320497 is a prime.

It is a super-2 number, since 2×2505320561² = 12553262226738709442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2505320501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5197520 + ... + 5198001.

It is an arithmetic number, because the mean of its divisors is an integer number (628929081).

Almost surely, 2^2505320561 is an apocalyptic number.

It is an amenable number.

2505320561 is a deficient number, since it is larger than the sum of its proper divisors (10395763).

2505320561 is a wasteful number, since it uses less digits than its factorization.

2505320561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10395762.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 2505320561 is about 50053.1773317139. The cubic root of 2505320561 is about 1358.1709410424.

The spelling of 2505320561 in words is "two billion, five hundred five million, three hundred twenty thousand, five hundred sixty-one".