217904079466 has 8 divisors (see below), whose sum is σ = 326859414084. Its totient is φ = 108950941440.

The previous prime is 217904079439. The next prime is 217904079479. The reversal of 217904079466 is 664970409712.

It can be written as a sum of positive squares in 2 ways, for example, as 132885766225 + 85018313241 = 364535^2 + 291579^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 273465 + ... + 714556.

Almost surely, 2^217904079466 is an apocalyptic number.

217904079466 is a deficient number, since it is larger than the sum of its proper divisors (108955334618).

217904079466 is a wasteful number, since it uses less digits than its factorization.

217904079466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098296.

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 217904079466 in words is "two hundred seventeen billion, nine hundred four million, seventy-nine thousand, four hundred sixty-six".