2665985549 has 2 divisors, whose sum is σ = 2665985550. Its totient is φ = 2665985548.

The previous prime is 2665985537. The next prime is 2665985579. The reversal of 2665985549 is 9455895662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2002562500 + 663423049 = 44750^2 + 25757^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665985549 - 2¹⁶ = 2665920013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2665985579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332992774 + 1332992775.

It is an arithmetic number, because the mean of its divisors is an integer number (1332992775).

Almost surely, 2^2665985549 is an apocalyptic number.

It is an amenable number.

2665985549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665985549 is an equidigital number, since it uses as much as digits as its factorization.

2665985549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328000, while the sum is 59.

The square root of 2665985549 is about 51633.1826348134. The cubic root of 2665985549 is about 1386.6044734945.

The spelling of 2665985549 in words is "two billion, six hundred sixty-five million, nine hundred eighty-five thousand, five hundred forty-nine".