1664133444 has 96 divisors (see below), whose sum is σ = 4647444480. Its totient is φ = 513453600.

The previous prime is 1664133439. The next prime is 1664133473. The reversal of 1664133444 is 4443314661.

1664133444 is a `hidden beast` number, since 1 + 6 + 641 + 3 + 3 + 4 + 4 + 4 = 666.

It is a super-2 number, since 2×1664133444² = 5538680238878602272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 1664133399 and 1664133408.

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, 66199 + ... + 87809.

It is an arithmetic number, because the mean of its divisors is an integer number (48410880).

Almost surely, 2^1664133444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664133444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2323722240).

1664133444 is an abundant number, since it is smaller than the sum of its proper divisors (2983311036).

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

1664133444 is a wasteful number, since it uses less digits than its factorization.

1664133444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21678 (or 21670 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 1664133444 is about 40793.7917335469. The cubic root of 1664133444 is about 1185.0301033852.

The spelling of 1664133444 in words is "one billion, six hundred sixty-four million, one hundred thirty-three thousand, four hundred forty-four".