2605707665 has 16 divisors (see below), whose sum is σ = 3425279616. Its totient is φ = 1887187200.

The previous prime is 2605707649. The next prime is 2605707701. The reversal of 2605707665 is 5667075062.

It is not a de Polignac number, because 2605707665 - 2⁴ = 2605707649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85037 + ... + 111546.

It is an arithmetic number, because the mean of its divisors is an integer number (214079976).

Almost surely, 2^2605707665 is an apocalyptic number.

It is an amenable number.

2605707665 is a deficient number, since it is larger than the sum of its proper divisors (819571951).

2605707665 is a wasteful number, since it uses less digits than its factorization.

2605707665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196840.

The product of its (nonzero) digits is 529200, while the sum is 44.

The square root of 2605707665 is about 51046.1327134583. The cubic root of 2605707665 is about 1376.0743409631.

The spelling of 2605707665 in words is "two billion, six hundred five million, seven hundred seven thousand, six hundred sixty-five".