664565565465 has 12 divisors (see below), whose sum is σ = 1151913646884. Its totient is φ = 354434968224.

The previous prime is 664565565451. The next prime is 664565565467. The reversal of 664565565465 is 564565565466.

664565565465 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 6 + 5 + 565 + 4 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 141524182809 + 523041382656 = 376197^2 + 723216^2 .

It is not a de Polignac number, because 664565565465 - 2⁶ = 664565565401 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (664565565467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7384061794 + ... + 7384061883.

It is an arithmetic number, because the mean of its divisors is an integer number (95992803907).

Almost surely, 2^664565565465 is an apocalyptic number.

It is an amenable number.

664565565465 is a deficient number, since it is larger than the sum of its proper divisors (487348081419).

664565565465 is a wasteful number, since it uses less digits than its factorization.

664565565465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14768123688 (or 14768123685 counting only the distinct ones).

The product of its digits is 388800000, while the sum is 63.

Subtracting from 664565565465 its reverse (564565565466), we obtain a palindrome (99999999999).

The spelling of 664565565465 in words is "six hundred sixty-four billion, five hundred sixty-five million, five hundred sixty-five thousand, four hundred sixty-five".