216943880105 has 4 divisors (see below), whose sum is σ = 260332656132. Its totient is φ = 173555104080.

The previous prime is 216943880081. The next prime is 216943880129. The reversal of 216943880105 is 501088349612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (216943880081) and next prime (216943880129).

It can be written as a sum of positive squares in 2 ways, for example, as 73911665689 + 143032214416 = 271867^2 + 378196^2 .

It is not a de Polignac number, because 216943880105 - 2²² = 216939685801 is a prime.

It is a super-2 number, since 2×216943880105² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216943880105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21694388006 + ... + 21694388015.

It is an arithmetic number, because the mean of its divisors is an integer number (65083164033).

Almost surely, 2^216943880105 is an apocalyptic number.

It is an amenable number.

216943880105 is a deficient number, since it is larger than the sum of its proper divisors (43388776027).

216943880105 is an equidigital number, since it uses as much as digits as its factorization.

216943880105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43388776026.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 216943880105 in words is "two hundred sixteen billion, nine hundred forty-three million, eight hundred eighty thousand, one hundred five".