216181831058405 has 16 divisors (see below), whose sum is σ = 259776494651520. Its totient is φ = 172706718583872.

The previous prime is 216181831058383. The next prime is 216181831058447. The reversal of 216181831058405 is 504850138181612.

It is a cyclic number.

It is not a de Polignac number, because 216181831058405 - 2²⁰ = 216181830009829 is a prime.

It is a super-2 number, since 2×216181831058405² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7164947 + ... + 21993183.

It is an arithmetic number, because the mean of its divisors is an integer number (16236030915720).

Almost surely, 2^{216181831058405} is an apocalyptic number.

It is an amenable number.

216181831058405 is a deficient number, since it is larger than the sum of its proper divisors (43594663593115).

216181831058405 is a wasteful number, since it uses less digits than its factorization.

216181831058405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14832268.

The product of its (nonzero) digits is 1843200, while the sum is 53.

The spelling of 216181831058405 in words is "two hundred sixteen trillion, one hundred eighty-one billion, eight hundred thirty-one million, fifty-eight thousand, four hundred five".