216664241440641 has 8 divisors (see below), whose sum is σ = 288886254389760. Its totient is φ = 144442528059312.

The previous prime is 216664241440627. The next prime is 216664241440693. The reversal of 216664241440641 is 146044142466612.

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

It is not a de Polignac number, because 216664241440641 - 2⁷ = 216664241440513 is a prime.

It is a super-2 number, since 2×216664241440641² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216664241440441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73198881 + ... + 76101278.

It is an arithmetic number, because the mean of its divisors is an integer number (36110781798720).

Almost surely, 2^{216664241440641} is an apocalyptic number.

It is an amenable number.

216664241440641 is a deficient number, since it is larger than the sum of its proper divisors (72222012949119).

216664241440641 is a wasteful number, since it uses less digits than its factorization.

216664241440641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149783895.

The product of its (nonzero) digits is 5308416, while the sum is 51.

The spelling of 216664241440641 in words is "two hundred sixteen trillion, six hundred sixty-four billion, two hundred forty-one million, four hundred forty thousand, six hundred forty-one".