1664297712 has 160 divisors (see below), whose sum is σ = 5956047360. Its totient is φ = 432276480.

The previous prime is 1664297699. The next prime is 1664297731. The reversal of 1664297712 is 2177924661.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8248 + ... + 58280.

It is an arithmetic number, because the mean of its divisors is an integer number (37225296).

Almost surely, 2^1664297712 is an apocalyptic number.

1664297712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664297712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2978023680).

1664297712 is an abundant number, since it is smaller than the sum of its proper divisors (4291749648).

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

1664297712 is a wasteful number, since it uses less digits than its factorization.

1664297712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50068 (or 50056 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 1664297712 is about 40795.8050784636. The cubic root of 1664297712 is about 1185.0690938722.

The spelling of 1664297712 in words is "one billion, six hundred sixty-four million, two hundred ninety-seven thousand, seven hundred twelve".