664010505 has 24 divisors (see below), whose sum is σ = 1151634120. Its totient is φ = 353928960.

The previous prime is 664010491. The next prime is 664010507. The reversal of 664010505 is 505010466.

It is a happy number.

664010505 is a `hidden beast` number, since 6 + 640 + 10 + 5 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5934096 + 658076409 = 2436^2 + 25653^2 .

It is not a de Polignac number, because 664010505 - 2¹⁰ = 664009481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664010507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99411 + ... + 105879.

It is an arithmetic number, because the mean of its divisors is an integer number (47984755).

Almost surely, 2^664010505 is an apocalyptic number.

It is an amenable number.

664010505 is a deficient number, since it is larger than the sum of its proper divisors (487623615).

664010505 is a wasteful number, since it uses less digits than its factorization.

664010505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8761 (or 8758 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 664010505 is about 25768.4012891759. The cubic root of 664010505 is about 872.4187350250.

The spelling of 664010505 in words is "six hundred sixty-four million, ten thousand, five hundred five".