2685843581 has 2 divisors, whose sum is σ = 2685843582. Its totient is φ = 2685843580.

The previous prime is 2685843571. The next prime is 2685843619. The reversal of 2685843581 is 1853485862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1625299225 + 1060544356 = 40315^2 + 32566^2 .

It is a cyclic number.

It is not a de Polignac number, because 2685843581 - 2¹⁰ = 2685842557 is a prime.

It is a super-2 number, since 2×2685843581² = 14427511483197807122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2685843571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342921790 + 1342921791.

It is an arithmetic number, because the mean of its divisors is an integer number (1342921791).

Almost surely, 2^2685843581 is an apocalyptic number.

It is an amenable number.

2685843581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2685843581 is an equidigital number, since it uses as much as digits as its factorization.

2685843581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1843200, while the sum is 50.

The square root of 2685843581 is about 51825.1249974373. The cubic root of 2685843581 is about 1390.0387444991.

The spelling of 2685843581 in words is "two billion, six hundred eighty-five million, eight hundred forty-three thousand, five hundred eighty-one".