217385472868 has 6 divisors (see below), whose sum is σ = 380424577526. Its totient is φ = 108692736432.

The previous prime is 217385472851. The next prime is 217385472883. The reversal of 217385472868 is 868274583712.

217385472868 is digitally balanced in base 2, 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 only one way, i.e., 205854578944 + 11530893924 = 453712^2 + 107382^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27173184105 + ... + 27173184112.

Almost surely, 2^217385472868 is an apocalyptic number.

It is an amenable number.

217385472868 is a deficient number, since it is larger than the sum of its proper divisors (163039104658).

217385472868 is a wasteful number, since it uses less digits than its factorization.

217385472868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54346368221 (or 54346368219 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 61.

The spelling of 217385472868 in words is "two hundred seventeen billion, three hundred eighty-five million, four hundred seventy-two thousand, eight hundred sixty-eight".