216105556109 has 8 divisors (see below), whose sum is σ = 217796789280. Its totient is φ = 214416273456.

The previous prime is 216105556097. The next prime is 216105556127. The reversal of 216105556109 is 901655501612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216105556109 is a prime.

It is a super-2 number, since 2×216105556109² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216105576109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264779 + ... + 708744.

It is an arithmetic number, because the mean of its divisors is an integer number (27224598660).

Almost surely, 2^216105556109 is an apocalyptic number.

It is an amenable number.

216105556109 is a deficient number, since it is larger than the sum of its proper divisors (1691233171).

216105556109 is a wasteful number, since it uses less digits than its factorization.

216105556109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975259.

The product of its (nonzero) digits is 81000, while the sum is 41.

The spelling of 216105556109 in words is "two hundred sixteen billion, one hundred five million, five hundred fifty-six thousand, one hundred nine".