1664223566 has 16 divisors (see below), whose sum is σ = 2631321600. Its totient is φ = 787236408.

The previous prime is 1664223557. The next prime is 1664223569. The reversal of 1664223566 is 6653224661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664223569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1550 + ... + 57713.

It is an arithmetic number, because the mean of its divisors is an integer number (164457600).

Almost surely, 2^1664223566 is an apocalyptic number.

1664223566 is a deficient number, since it is larger than the sum of its proper divisors (967098034).

1664223566 is a wasteful number, since it uses less digits than its factorization.

1664223566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60023.

The product of its digits is 311040, while the sum is 41.

The square root of 1664223566 is about 40794.8963229471. The cubic root of 1664223566 is about 1185.0514949701.

The spelling of 1664223566 in words is "one billion, six hundred sixty-four million, two hundred twenty-three thousand, five hundred sixty-six".