609766665 has 16 divisors (see below), whose sum is σ = 990189888. Its totient is φ = 320354496.

The previous prime is 609766649. The next prime is 609766669. The reversal of 609766665 is 566667906.

609766665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 609766665 - 2⁴ = 609766649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (609766669) by changing a digit.

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, 302362 + ... + 304371.

It is an arithmetic number, because the mean of its divisors is an integer number (61886868).

Almost surely, 2^609766665 is an apocalyptic number.

It is an amenable number.

609766665 is a deficient number, since it is larger than the sum of its proper divisors (380423223).

609766665 is a wasteful number, since it uses less digits than its factorization.

609766665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606808.

The product of its (nonzero) digits is 2449440, while the sum is 51.

The square root of 609766665 is about 24693.4538896445. The cubic root of 609766665 is about 847.9844586159.

The spelling of 609766665 in words is "six hundred nine million, seven hundred sixty-six thousand, six hundred sixty-five".