1664007826 has 8 divisors (see below), whose sum is σ = 2688012684. Its totient is φ = 768003600.

The previous prime is 1664007809. The next prime is 1664007827. The reversal of 1664007826 is 6287004661.

It can be written as a sum of positive squares in 2 ways, for example, as 1434515625 + 229492201 = 37875^2 + 15149^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1664007827) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 32000125 + ... + 32000176.

Almost surely, 2^1664007826 is an apocalyptic number.

1664007826 is a deficient number, since it is larger than the sum of its proper divisors (1024004858).

1664007826 is a wasteful number, since it uses less digits than its factorization.

1664007826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64000316.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1664007826 is about 40792.2520339341. The cubic root of 1664007826 is about 1185.0002850919. Note that the first 3 decimals are identical.

The spelling of 1664007826 in words is "one billion, six hundred sixty-four million, seven thousand, eight hundred twenty-six".