605166665 has 16 divisors (see below), whose sum is σ = 741257616. Its totient is φ = 474163200.

The previous prime is 605166647. The next prime is 605166671. The reversal of 605166665 is 566661506.

It can be written as a sum of positive squares in 8 ways, for example, as 94225849 + 510940816 = 9707^2 + 22604^2 .

It is not a de Polignac number, because 605166665 - 2¹⁶ = 605101129 is a prime.

It is a Duffinian number.

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, 69389 + ... + 77621.

It is an arithmetic number, because the mean of its divisors is an integer number (46328601).

Almost surely, 2^605166665 is an apocalyptic number.

It is an amenable number.

605166665 is a deficient number, since it is larger than the sum of its proper divisors (136090951).

605166665 is a wasteful number, since it uses less digits than its factorization.

605166665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 605166665 is about 24600.1354671067. The cubic root of 605166665 is about 845.8467126477.

The spelling of 605166665 in words is "six hundred five million, one hundred sixty-six thousand, six hundred sixty-five".