664487784465 has 16 divisors (see below), whose sum is σ = 1063190788800. Its totient is φ = 354390040512.

The previous prime is 664487784437. The next prime is 664487784503. The reversal of 664487784465 is 564487784466.

It is not a de Polignac number, because 664487784465 - 2⁸ = 664487784209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664487784465.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2420166 + ... + 2680704.

It is an arithmetic number, because the mean of its divisors is an integer number (66449424300).

Almost surely, 2^664487784465 is an apocalyptic number.

It is an amenable number.

664487784465 is a deficient number, since it is larger than the sum of its proper divisors (398703004335).

664487784465 is a wasteful number, since it uses less digits than its factorization.

664487784465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430576.

The product of its digits is 867041280, while the sum is 69.

Subtracting from 664487784465 its reverse (564487784466), we obtain a palindrome (99999999999).

The spelling of 664487784465 in words is "six hundred sixty-four billion, four hundred eighty-seven million, seven hundred eighty-four thousand, four hundred sixty-five".