1664736064 has 14 divisors (see below), whose sum is σ = 3303460754. Its totient is φ = 832368000.

The previous prime is 1664736061. The next prime is 1664736071. The reversal of 1664736064 is 4606374661.

It can be written as a sum of positive squares in only one way, i.e., 1267929664 + 396806400 = 35608^2 + 19920^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1664736064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664736061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13005687 + ... + 13005814.

Almost surely, 2^1664736064 is an apocalyptic number.

It is an amenable number.

1664736064 is a deficient number, since it is larger than the sum of its proper divisors (1638724690).

1664736064 is an equidigital number, since it uses as much as digits as its factorization.

1664736064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26011513 (or 26011503 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 43.

The square root of 1664736064 is about 40801.1772379180. The cubic root of 1664736064 is about 1185.1731281050.

The spelling of 1664736064 in words is "one billion, six hundred sixty-four million, seven hundred thirty-six thousand, sixty-four".