211648664 has 16 divisors (see below), whose sum is σ = 397136520. Its totient is φ = 105745600.

The previous prime is 211648651. The next prime is 211648669. The reversal of 211648664 is 466846112.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211648669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2492 + ... + 20724.

Almost surely, 2^211648664 is an apocalyptic number.

It is an amenable number.

211648664 is a deficient number, since it is larger than the sum of its proper divisors (185487856).

211648664 is a wasteful number, since it uses less digits than its factorization.

211648664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19690 (or 19686 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 211648664 is about 14548.1498480047. The cubic root of 211648664 is about 595.9436233328.

The spelling of 211648664 in words is "two hundred eleven million, six hundred forty-eight thousand, six hundred sixty-four".