664635536466 has 64 divisors (see below), whose sum is σ = 1467053596800. Its totient is φ = 199059008000.

The previous prime is 664635536447. The next prime is 664635536479.

664635536466 is nontrivially palindromic in base 10.

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 3705340 + ... + 3880568.

It is an arithmetic number, because the mean of its divisors is an integer number (22922712450).

Almost surely, 2^664635536466 is an apocalyptic number.

664635536466 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 664635536466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733526798400).

664635536466 is an abundant number, since it is smaller than the sum of its proper divisors (802418060334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664635536466 is a wasteful number, since it uses less digits than its factorization.

664635536466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175915.

The product of its digits is 167961600, while the sum is 60.

The spelling of 664635536466 in words is "six hundred sixty-four billion, six hundred thirty-five million, five hundred thirty-six thousand, four hundred sixty-six".