218422078565890 has 32 divisors (see below), whose sum is σ = 396378277802496. Its totient is φ = 86654332826880.

The previous prime is 218422078565839. The next prime is 218422078565963. The reversal of 218422078565890 is 98565870224812.

218422078565890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43342647 + ... + 48118906.

It is an arithmetic number, because the mean of its divisors is an integer number (12386821181328).

Almost surely, 2^{218422078565890} is an apocalyptic number.

218422078565890 is a deficient number, since it is larger than the sum of its proper divisors (177956199236606).

218422078565890 is a wasteful number, since it uses less digits than its factorization.

218422078565890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91463514.

The product of its (nonzero) digits is 154828800, while the sum is 67.

The spelling of 218422078565890 in words is "two hundred eighteen trillion, four hundred twenty-two billion, seventy-eight million, five hundred sixty-five thousand, eight hundred ninety".