1664213006 has 4 divisors (see below), whose sum is σ = 2496319512. Its totient is φ = 832106502.

The previous prime is 1664213003. The next prime is 1664213063. The reversal of 1664213006 is 6003124661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6003124661 = 113 ⋅53124997.

It is a self number, because there is not a number n which added to its sum of digits gives 1664213006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664213003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416053250 + ... + 416053253.

It is an arithmetic number, because the mean of its divisors is an integer number (624079878).

Almost surely, 2^1664213006 is an apocalyptic number.

1664213006 is a deficient number, since it is larger than the sum of its proper divisors (832106506).

1664213006 is an equidigital number, since it uses as much as digits as its factorization.

1664213006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832106505.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1664213006 is about 40794.7668947869. The cubic root of 1664213006 is about 1185.0489884618.

Adding to 1664213006 its reverse (6003124661), we get a palindrome (7667337667).

The spelling of 1664213006 in words is "one billion, six hundred sixty-four million, two hundred thirteen thousand, six".