216664298641 has 8 divisors (see below), whose sum is σ = 260648780480. Its totient is φ = 175937926608.

The previous prime is 216664298639. The next prime is 216664298651. The reversal of 216664298641 is 146892466612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 216664298641 - 2¹ = 216664298639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216664298651) 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 7 ways as a sum of consecutive naturals, for example, 814527306 + ... + 814527571.

It is an arithmetic number, because the mean of its divisors is an integer number (32581097560).

Almost surely, 2^216664298641 is an apocalyptic number.

It is an amenable number.

216664298641 is a deficient number, since it is larger than the sum of its proper divisors (43984481839).

216664298641 is a wasteful number, since it uses less digits than its factorization.

216664298641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629054903.

The product of its digits is 5971968, while the sum is 55.

The spelling of 216664298641 in words is "two hundred sixteen billion, six hundred sixty-four million, two hundred ninety-eight thousand, six hundred forty-one".