216663247501 has 2 divisors, whose sum is σ = 216663247502. Its totient is φ = 216663247500.

The previous prime is 216663247499. The next prime is 216663247529. The reversal of 216663247501 is 105742366612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215026964100 + 1636283401 = 463710^2 + 40451^2 .

It is a cyclic number.

It is not a de Polignac number, because 216663247501 - 2¹ = 216663247499 is a prime.

Together with 216663247499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216663242501) 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 as a sum of consecutive naturals, namely, 108331623750 + 108331623751.

It is an arithmetic number, because the mean of its divisors is an integer number (108331623751).

Almost surely, 2^216663247501 is an apocalyptic number.

It is an amenable number.

216663247501 is a deficient number, since it is larger than the sum of its proper divisors (1).

216663247501 is an equidigital number, since it uses as much as digits as its factorization.

216663247501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 216663247501 in words is "two hundred sixteen billion, six hundred sixty-three million, two hundred forty-seven thousand, five hundred one".