601605665 has 4 divisors (see below), whose sum is σ = 721926804. Its totient is φ = 481284528.

The previous prime is 601605659. The next prime is 601605689. The reversal of 601605665 is 566506106.

601605665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 289306081 + 312299584 = 17009^2 + 17672^2 .

It is a cyclic number.

It is not a de Polignac number, because 601605665 - 2⁶ = 601605601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60160562 + ... + 60160571.

It is an arithmetic number, because the mean of its divisors is an integer number (180481701).

Almost surely, 2^601605665 is an apocalyptic number.

It is an amenable number.

601605665 is a deficient number, since it is larger than the sum of its proper divisors (120321139).

601605665 is a wasteful number, since it uses less digits than its factorization.

601605665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120321138.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 601605665 is about 24527.6510289917. The cubic root of 601605665 is about 844.1843675492.

The spelling of 601605665 in words is "six hundred one million, six hundred five thousand, six hundred sixty-five".