216181831058447 has 2 divisors, whose sum is σ = 216181831058448. Its totient is φ = 216181831058446.

The previous prime is 216181831058383. The next prime is 216181831058467. The reversal of 216181831058447 is 744850138181612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216181831058447 - 2⁶ = 216181831058383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216181831058467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108090915529223 + 108090915529224.

It is an arithmetic number, because the mean of its divisors is an integer number (108090915529224).

Almost surely, 2^{216181831058447} is an apocalyptic number.

216181831058447 is a deficient number, since it is larger than the sum of its proper divisors (1).

216181831058447 is an equidigital number, since it uses as much as digits as its factorization.

216181831058447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10321920, while the sum is 59.

The spelling of 216181831058447 in words is "two hundred sixteen trillion, one hundred eighty-one billion, eight hundred thirty-one million, fifty-eight thousand, four hundred forty-seven".