2580661 has 2 divisors, whose sum is σ = 2580662. Its totient is φ = 2580660.

The previous prime is 2580659. The next prime is 2580667. The reversal of 2580661 is 1660852.

2580661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2047761 + 532900 = 1431^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 2580661 - 2¹ = 2580659 is a prime.

It is a super-2 number, since 2×2580661² = 13319622393842, which contains 22 as substring.

Together with 2580659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2580667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290330 + 1290331.

It is an arithmetic number, because the mean of its divisors is an integer number (1290331).

2^2580661 is an apocalyptic number.

It is an amenable number.

2580661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2580661 is an equidigital number, since it uses as much as digits as its factorization.

2580661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2580661 is about 1606.4435875561. The cubic root of 2580661 is about 137.1651089783.

The spelling of 2580661 in words is "two million, five hundred eighty thousand, six hundred sixty-one".