216336349454891 has 2 divisors, whose sum is σ = 216336349454892. Its totient is φ = 216336349454890.

The previous prime is 216336349454839. The next prime is 216336349454917. The reversal of 216336349454891 is 198454943633612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216336349454891 - 2³⁴ = 216319169585707 is a prime.

It is not a weakly prime, because it can be changed into another prime (216336349454821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108168174727445 + 108168174727446.

It is an arithmetic number, because the mean of its divisors is an integer number (108168174727446).

Almost surely, 2^{216336349454891} is an apocalyptic number.

216336349454891 is a deficient number, since it is larger than the sum of its proper divisors (1).

216336349454891 is an equidigital number, since it uses as much as digits as its factorization.

216336349454891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403107840, while the sum is 68.

The spelling of 216336349454891 in words is "two hundred sixteen trillion, three hundred thirty-six billion, three hundred forty-nine million, four hundred fifty-four thousand, eight hundred ninety-one".