2620504561 has 2 divisors, whose sum is σ = 2620504562. Its totient is φ = 2620504560.

The previous prime is 2620504543. The next prime is 2620504577. The reversal of 2620504561 is 1654050262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2174450161 + 446054400 = 46631^2 + 21120^2 .

It is a cyclic number.

It is not a de Polignac number, because 2620504561 - 2¹¹ = 2620502513 is a prime.

It is not a weakly prime, because it can be changed into another prime (2620504511) 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 as a sum of consecutive naturals, namely, 1310252280 + 1310252281.

It is an arithmetic number, because the mean of its divisors is an integer number (1310252281).

Almost surely, 2^2620504561 is an apocalyptic number.

It is an amenable number.

2620504561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2620504561 is an equidigital number, since it uses as much as digits as its factorization.

2620504561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 2620504561 is about 51190.8640384200. The cubic root of 2620504561 is about 1378.6741731374.

The spelling of 2620504561 in words is "two billion, six hundred twenty million, five hundred four thousand, five hundred sixty-one".