216578273894 has 16 divisors (see below), whose sum is σ = 333727323696. Its totient is φ = 105337231200.

The previous prime is 216578273809. The next prime is 216578273911. The reversal of 216578273894 is 498372875612.

It is a super-2 number, since 2×216578273894² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35897 + ... + 659124.

It is an arithmetic number, because the mean of its divisors is an integer number (20857957731).

Almost surely, 2^216578273894 is an apocalyptic number.

216578273894 is a deficient number, since it is larger than the sum of its proper divisors (117149049802).

216578273894 is a wasteful number, since it uses less digits than its factorization.

216578273894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699271.

The product of its digits is 40642560, while the sum is 62.

The spelling of 216578273894 in words is "two hundred sixteen billion, five hundred seventy-eight million, two hundred seventy-three thousand, eight hundred ninety-four".