217066745090 has 24 divisors (see below), whose sum is σ = 423087493428. Its totient is φ = 80147720640.

The previous prime is 217066745059. The next prime is 217066745107. The reversal of 217066745090 is 90547660712.

217066745090 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 78919979329 + 138146765761 = 280927^2 + 371681^2 .

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 64219241 + ... + 64222620.

Almost surely, 2^217066745090 is an apocalyptic number.

217066745090 is a deficient number, since it is larger than the sum of its proper divisors (206020748338).

217066745090 is a wasteful number, since it uses less digits than its factorization.

217066745090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128441894 (or 128441881 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 217066745090 in words is "two hundred seventeen billion, sixty-six million, seven hundred forty-five thousand, ninety".