216689337323291 has 32 divisors (see below), whose sum is σ = 248594796223488. Its totient is φ = 185022486190080.

The previous prime is 216689337323269. The next prime is 216689337323297. The reversal of 216689337323291 is 192323733986612.

It is a happy number.

It is not a de Polignac number, because 216689337323291 - 2¹⁰ = 216689337322267 is a prime.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216689337323297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11957903711 + ... + 11957921831.

It is an arithmetic number, because the mean of its divisors is an integer number (7768587381984).

Almost surely, 2^{216689337323291} is an apocalyptic number.

216689337323291 is a deficient number, since it is larger than the sum of its proper divisors (31905458900197).

216689337323291 is a wasteful number, since it uses less digits than its factorization.

216689337323291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23051.

The product of its digits is 105815808, while the sum is 65.

The spelling of 216689337323291 in words is "two hundred sixteen trillion, six hundred eighty-nine billion, three hundred thirty-seven million, three hundred twenty-three thousand, two hundred ninety-one".