216872708873 has 4 divisors (see below), whose sum is σ = 229629927060. Its totient is φ = 204115490688.

The previous prime is 216872708869. The next prime is 216872708887. The reversal of 216872708873 is 378807278612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105003865849 + 111868843024 = 324043^2 + 334468^2 .

It is a cyclic number.

It is not a de Polignac number, because 216872708873 - 2² = 216872708869 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216872705873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6378609068 + ... + 6378609101.

It is an arithmetic number, because the mean of its divisors is an integer number (57407481765).

Almost surely, 2^216872708873 is an apocalyptic number.

It is an amenable number.

216872708873 is a deficient number, since it is larger than the sum of its proper divisors (12757218187).

216872708873 is a wasteful number, since it uses less digits than its factorization.

216872708873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12757218186.

The product of its (nonzero) digits is 12644352, while the sum is 59.

The spelling of 216872708873 in words is "two hundred sixteen billion, eight hundred seventy-two million, seven hundred eight thousand, eight hundred seventy-three".