1664044326 has 48 divisors (see below), whose sum is σ = 4140085248. Its totient is φ = 473180400.

The previous prime is 1664044289. The next prime is 1664044363. The reversal of 1664044326 is 6234404661.

1664044326 is a `hidden beast` number, since 1 + 6 + 640 + 4 + 4 + 3 + 2 + 6 = 666.

1664044326 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1664044289) and next prime (1664044363).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4710 + ... + 57881.

It is an arithmetic number, because the mean of its divisors is an integer number (86251776).

Almost surely, 2^1664044326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664044326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2070042624).

1664044326 is an abundant number, since it is smaller than the sum of its proper divisors (2476040922).

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

1664044326 is a wasteful number, since it uses less digits than its factorization.

1664044326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62817 (or 62814 counting only the distinct ones).

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

The square root of 1664044326 is about 40792.6994203620. The cubic root of 1664044326 is about 1185.0089493529.

Adding to 1664044326 its reverse (6234404661), we get a palindrome (7898448987).

The spelling of 1664044326 in words is "one billion, six hundred sixty-four million, forty-four thousand, three hundred twenty-six".