216406745678 has 8 divisors (see below), whose sum is σ = 324616532160. Its totient is φ = 108201234960.

The previous prime is 216406745671. The next prime is 216406745717. The reversal of 216406745678 is 876547604612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216406745671) 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, 939263 + ... + 1146746.

It is an arithmetic number, because the mean of its divisors is an integer number (40577066520).

Almost surely, 2^216406745678 is an apocalyptic number.

216406745678 is a deficient number, since it is larger than the sum of its proper divisors (108209786482).

216406745678 is a wasteful number, since it uses less digits than its factorization.

216406745678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137882.

The product of its (nonzero) digits is 13547520, while the sum is 56.

The spelling of 216406745678 in words is "two hundred sixteen billion, four hundred six million, seven hundred forty-five thousand, six hundred seventy-eight".