1664544666 has 32 divisors (see below), whose sum is σ = 3519662400. Its totient is φ = 523342080.

The previous prime is 1664544653. The next prime is 1664544667. The reversal of 1664544666 is 6664454661.

It is not an unprimeable number, because it can be changed into a prime (1664544667) by changing a digit.

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, 5775 + ... + 57986.

It is an arithmetic number, because the mean of its divisors is an integer number (109989450).

Almost surely, 2^1664544666 is an apocalyptic number.

1664544666 is an abundant number, since it is smaller than the sum of its proper divisors (1855117734).

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

1664544666 is a wasteful number, since it uses less digits than its factorization.

1664544666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64014.

The product of its digits is 2488320, while the sum is 48.

The square root of 1664544666 is about 40798.8316744487. The cubic root of 1664544666 is about 1185.1277057974.

The spelling of 1664544666 in words is "one billion, six hundred sixty-four million, five hundred forty-four thousand, six hundred sixty-six".