605720665 has 16 divisors (see below), whose sum is σ = 834678720. Its totient is φ = 417337920.

The previous prime is 605720641. The next prime is 605720681. The reversal of 605720665 is 566027506.

It is not a de Polignac number, because 605720665 - 2²⁷ = 471502937 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 288774 + ... + 290863.

It is an arithmetic number, because the mean of its divisors is an integer number (52167420).

Almost surely, 2^605720665 is an apocalyptic number.

It is an amenable number.

605720665 is a deficient number, since it is larger than the sum of its proper divisors (228958055).

605720665 is a wasteful number, since it uses less digits than its factorization.

605720665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579672.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 605720665 is about 24611.3929918646. The cubic root of 605720665 is about 846.1047441320.

The spelling of 605720665 in words is "six hundred five million, seven hundred twenty thousand, six hundred sixty-five".