2605665489 has 8 divisors (see below), whose sum is σ = 3970537920. Its totient is φ = 1488951696.

The previous prime is 2605665479. The next prime is 2605665493. The reversal of 2605665489 is 9845665062.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2605665489 - 2⁴ = 2605665473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2605665449) 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 in 7 ways as a sum of consecutive naturals, for example, 62039634 + ... + 62039675.

It is an arithmetic number, because the mean of its divisors is an integer number (496317240).

Almost surely, 2^2605665489 is an apocalyptic number.

It is an amenable number.

2605665489 is a deficient number, since it is larger than the sum of its proper divisors (1364872431).

2605665489 is a wasteful number, since it uses less digits than its factorization.

2605665489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124079319.

The product of its (nonzero) digits is 3110400, while the sum is 51.

The square root of 2605665489 is about 51045.7195952805. The cubic root of 2605665489 is about 1376.0669165405.

The spelling of 2605665489 in words is "two billion, six hundred five million, six hundred sixty-five thousand, four hundred eighty-nine".