1664066268 has 120 divisors (see below), whose sum is σ = 4507069952. Its totient is φ = 534957696.

The previous prime is 1664066207. The next prime is 1664066273. The reversal of 1664066268 is 8626604661.

1664066268 is a `hidden beast` number, since 16 + 6 + 4 + 0 + 6 + 626 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1521930 + ... + 1523022.

Almost surely, 2^1664066268 is an apocalyptic number.

1664066268 is a gapful number since it is divisible by the number (18) 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 1664066268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2253534976).

1664066268 is an abundant number, since it is smaller than the sum of its proper divisors (2843003684).

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

1664066268 is a wasteful number, since it uses less digits than its factorization.

1664066268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273 (or 1262 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 1664066268 is about 40792.9683646581. The cubic root of 1664066268 is about 1185.0141578184.

The spelling of 1664066268 in words is "one billion, six hundred sixty-four million, sixty-six thousand, two hundred sixty-eight".