664206343502265 has 24 divisors (see below), whose sum is σ = 1160079476295168. Its totient is φ = 351539235234720.

The previous prime is 664206343502243. The next prime is 664206343502267. The reversal of 664206343502265 is 562205343602466.

664206343502265 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 0 + 63 + 4 + 350 + 226 + 5 = 666.

It is not a de Polignac number, because 664206343502265 - 2³⁰ = 664205269760441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664206343502267) 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, 56336410009 + ... + 56336421798.

It is an arithmetic number, because the mean of its divisors is an integer number (48336644845632).

Almost surely, 2^{664206343502265} is an apocalyptic number.

It is an amenable number.

664206343502265 is a deficient number, since it is larger than the sum of its proper divisors (495873132792903).

664206343502265 is a wasteful number, since it uses less digits than its factorization.

664206343502265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112672831949 (or 112672831946 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 54.

The spelling of 664206343502265 in words is "six hundred sixty-four trillion, two hundred six billion, three hundred forty-three million, five hundred two thousand, two hundred sixty-five".