216688449927890 has 64 divisors (see below), whose sum is σ = 392076609200640. Its totient is φ = 86223347965440.

The previous prime is 216688449927769. The next prime is 216688449927893. The reversal of 216688449927890 is 98729944886612.

216688449927890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 216688449927799 and 216688449927808.

It is not an unprimeable number, because it can be changed into a prime (216688449927893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20662572227 + ... + 20662582713.

It is an arithmetic number, because the mean of its divisors is an integer number (6126197018760).

Almost surely, 2^{216688449927890} is an apocalyptic number.

216688449927890 is a deficient number, since it is larger than the sum of its proper divisors (175388159272750).

216688449927890 is a wasteful number, since it uses less digits than its factorization.

216688449927890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18107.

The product of its (nonzero) digits is 6019743744, while the sum is 83.

The spelling of 216688449927890 in words is "two hundred sixteen trillion, six hundred eighty-eight billion, four hundred forty-nine million, nine hundred twenty-seven thousand, eight hundred ninety".