664581185466 has 32 divisors (see below), whose sum is σ = 1453540593600. Its totient is φ = 200895838080.

The previous prime is 664581185461. The next prime is 664581185479.

It is a happy number.

664581185466 is nontrivially palindromic in base 10.

664581185466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (664581185461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12282801 + ... + 12336788.

It is an arithmetic number, because the mean of its divisors is an integer number (45423143550).

Almost surely, 2^664581185466 is an apocalyptic number.

664581185466 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

664581185466 is an abundant number, since it is smaller than the sum of its proper divisors (788959408134).

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

664581185466 is a wasteful number, since it uses less digits than its factorization.

664581185466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24620014.

The product of its digits is 33177600, while the sum is 60.

The spelling of 664581185466 in words is "six hundred sixty-four billion, five hundred eighty-one million, one hundred eighty-five thousand, four hundred sixty-six".