664315605 has 12 divisors (see below), whose sum is σ = 1151480460. Its totient is φ = 354301632.

The previous prime is 664315543. The next prime is 664315609. The reversal of 664315605 is 506513466.

664315605 is a `hidden beast` number, since 6 + 6 + 43 + 1 + 5 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 502746084 + 161569521 = 22422^2 + 12711^2 .

It is not a de Polignac number, because 664315605 - 2⁸ = 664315349 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 664315605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664315609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7381240 + ... + 7381329.

It is an arithmetic number, because the mean of its divisors is an integer number (95956705).

Almost surely, 2^664315605 is an apocalyptic number.

It is an amenable number.

664315605 is a deficient number, since it is larger than the sum of its proper divisors (487164855).

664315605 is a wasteful number, since it uses less digits than its factorization.

664315605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14762580 (or 14762577 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 664315605 is about 25774.3206506011. The cubic root of 664315605 is about 872.5523344169.

The spelling of 664315605 in words is "six hundred sixty-four million, three hundred fifteen thousand, six hundred five".