216451645664 has 48 divisors (see below), whose sum is σ = 430723264608. Its totient is φ = 107063795712.

The previous prime is 216451645651. The next prime is 216451645673. The reversal of 216451645664 is 466546154612.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 3186584 + ... + 3253800.

It is an arithmetic number, because the mean of its divisors is an integer number (8973401346).

Almost surely, 2^216451645664 is an apocalyptic number.

It is an amenable number.

216451645664 is a deficient number, since it is larger than the sum of its proper divisors (214271618944).

216451645664 is a wasteful number, since it uses less digits than its factorization.

216451645664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68307 (or 68299 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 50.

The spelling of 216451645664 in words is "two hundred sixteen billion, four hundred fifty-one million, six hundred forty-five thousand, six hundred sixty-four".