2620964561 has 2 divisors, whose sum is σ = 2620964562. Its totient is φ = 2620964560.

The previous prime is 2620964551. The next prime is 2620964573. The reversal of 2620964561 is 1654690262.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2149249600 + 471714961 = 46360^2 + 21719^2 .

It is a cyclic number.

It is not a de Polignac number, because 2620964561 - 2⁶ = 2620964497 is a prime.

It is not a weakly prime, because it can be changed into another prime (2620964551) 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, 1310482280 + 1310482281.

It is an arithmetic number, because the mean of its divisors is an integer number (1310482281).

Almost surely, 2^2620964561 is an apocalyptic number.

It is an amenable number.

2620964561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2620964561 is an equidigital number, since it uses as much as digits as its factorization.

2620964561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 2620964561 is about 51195.3568304783. The cubic root of 2620964561 is about 1378.7548386480.

The spelling of 2620964561 in words is "two billion, six hundred twenty million, nine hundred sixty-four thousand, five hundred sixty-one".