216280656109 has 12 divisors (see below), whose sum is σ = 251627171004. Its totient is φ = 185357344704.

The previous prime is 216280656043. The next prime is 216280656131. The reversal of 216280656109 is 901656082612.

It can be written as a sum of positive squares in 2 ways, for example, as 69104842884 + 147175813225 = 262878^2 + 383635^2 .

It is not a de Polignac number, because 216280656109 - 2²¹ = 216278558957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216280656199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45639 + ... + 659275.

It is an arithmetic number, because the mean of its divisors is an integer number (20968930917).

Almost surely, 2^216280656109 is an apocalyptic number.

It is an amenable number.

216280656109 is a deficient number, since it is larger than the sum of its proper divisors (35346514895).

216280656109 is an equidigital number, since it uses as much as digits as its factorization.

216280656109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620844 (or 620837 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 216280656109 in words is "two hundred sixteen billion, two hundred eighty million, six hundred fifty-six thousand, one hundred nine".