216206885178278 has 4 divisors (see below), whose sum is σ = 324310327767420. Its totient is φ = 108103442589138.

The previous prime is 216206885178247. The next prime is 216206885178289. The reversal of 216206885178278 is 872871588602612.

216206885178278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54051721294568 + ... + 54051721294571.

It is an arithmetic number, because the mean of its divisors is an integer number (81077581941855).

Almost surely, 2^{216206885178278} is an apocalyptic number.

216206885178278 is a deficient number, since it is larger than the sum of its proper divisors (108103442589142).

216206885178278 is a wasteful number, since it uses less digits than its factorization.

216206885178278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108103442589141.

The product of its (nonzero) digits is 289013760, while the sum is 71.

The spelling of 216206885178278 in words is "two hundred sixteen trillion, two hundred six billion, eight hundred eighty-five million, one hundred seventy-eight thousand, two hundred seventy-eight".