664536635465 has 16 divisors (see below), whose sum is σ = 798178752000. Its totient is φ = 531139688640.

The previous prime is 664536635387. The next prime is 664536635473. The reversal of 664536635465 is 564536635466.

It is not a de Polignac number, because 664536635465 - 2¹⁸ = 664536373321 is a prime.

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, 26184212 + ... + 26209578.

It is an arithmetic number, because the mean of its divisors is an integer number (49886172000).

Almost surely, 2^664536635465 is an apocalyptic number.

It is an amenable number.

664536635465 is a deficient number, since it is larger than the sum of its proper divisors (133642116535).

664536635465 is a wasteful number, since it uses less digits than its factorization.

664536635465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29992.

The product of its digits is 139968000, while the sum is 59.

Subtracting from 664536635465 its reverse (564536635466), we obtain a palindrome (99999999999).

The spelling of 664536635465 in words is "six hundred sixty-four billion, five hundred thirty-six million, six hundred thirty-five thousand, four hundred sixty-five".