664122221466 has 64 divisors (see below), whose sum is σ = 1454637035520. Its totient is φ = 200466928640.

The previous prime is 664122221461. The next prime is 664122221519.

664122221466 is nontrivially palindromic in base 10.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664122221461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17780026 + ... + 17817338.

It is an arithmetic number, because the mean of its divisors is an integer number (22728703680).

Almost surely, 2^664122221466 is an apocalyptic number.

664122221466 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

664122221466 is an abundant number, since it is smaller than the sum of its proper divisors (790514814054).

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

664122221466 is a wasteful number, since it uses less digits than its factorization.

664122221466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38371.

The product of its digits is 331776, while the sum is 42.

It can be divided in two parts, 664122 and 221466, that added together give a palindrome (885588).

The spelling of 664122221466 in words is "six hundred sixty-four billion, one hundred twenty-two million, two hundred twenty-one thousand, four hundred sixty-six".