216778258143 has 12 divisors (see below), whose sum is σ = 313183737048. Its totient is φ = 144491337360.

The previous prime is 216778258139. The next prime is 216778258159. The reversal of 216778258143 is 341852877612.

216778258143 is a `hidden beast` number, since 2 + 16 + 7 + 7 + 8 + 2 + 581 + 43 = 666.

It is not a de Polignac number, because 216778258143 - 2² = 216778258139 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 216778258143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216778259143) 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, 2241805 + ... + 2336502.

It is an arithmetic number, because the mean of its divisors is an integer number (26098644754).

Almost surely, 2^216778258143 is an apocalyptic number.

216778258143 is a deficient number, since it is larger than the sum of its proper divisors (96405478905).

216778258143 is a wasteful number, since it uses less digits than its factorization.

216778258143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4583574 (or 4583571 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The spelling of 216778258143 in words is "two hundred sixteen billion, seven hundred seventy-eight million, two hundred fifty-eight thousand, one hundred forty-three".