664143505341466 has 4 divisors (see below), whose sum is σ = 996215258012202. Its totient is φ = 332071752670732.

The previous prime is 664143505341451. The next prime is 664143505341469.

664143505341466 is nontrivially palindromic in base 10.

664143505341466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 599268196802025 + 64875308539441 = 24479955^2 + 8054521^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 664143505341466.

It is not an unprimeable number, because it can be changed into a prime (664143505341469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166035876335365 + ... + 166035876335368.

Almost surely, 2^{664143505341466} is an apocalyptic number.

664143505341466 is a deficient number, since it is larger than the sum of its proper divisors (332071752670736).

664143505341466 is a wasteful number, since it uses less digits than its factorization.

664143505341466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332071752670735.

The product of its (nonzero) digits is 74649600, while the sum is 58.

The spelling of 664143505341466 in words is "six hundred sixty-four trillion, one hundred forty-three billion, five hundred five million, three hundred forty-one thousand, four hundred sixty-six".