664560557465 has 64 divisors (see below), whose sum is σ = 927142723584. Its totient is φ = 447913525248.

The previous prime is 664560557431. The next prime is 664560557473. The reversal of 664560557465 is 564755065466.

It is not a de Polignac number, because 664560557465 - 2⁸ = 664560557209 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 225044429 + ... + 225047381.

It is an arithmetic number, because the mean of its divisors is an integer number (14486605056).

Almost surely, 2^664560557465 is an apocalyptic number.

It is an amenable number.

664560557465 is a deficient number, since it is larger than the sum of its proper divisors (262582166119).

664560557465 is a wasteful number, since it uses less digits than its factorization.

664560557465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3546.

The product of its (nonzero) digits is 90720000, while the sum is 59.

The spelling of 664560557465 in words is "six hundred sixty-four billion, five hundred sixty million, five hundred fifty-seven thousand, four hundred sixty-five".