217974478804 has 12 divisors (see below), whose sum is σ = 381496083444. Its totient is φ = 108975597824.

The previous prime is 217974478793. The next prime is 217974478853. The reversal of 217974478804 is 408874479712.

It is a happy number.

217974478804 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 2 ways, for example, as 123355488400 + 94618990404 = 351220^2 + 307602^2 .

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 2868199 + ... + 2943214.

It is an arithmetic number, because the mean of its divisors is an integer number (31791340287).

Almost surely, 2^217974478804 is an apocalyptic number.

It is an amenable number.

217974478804 is a deficient number, since it is larger than the sum of its proper divisors (163521604640).

217974478804 is a wasteful number, since it uses less digits than its factorization.

217974478804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5820794 (or 5820792 counting only the distinct ones).

The product of its (nonzero) digits is 25288704, while the sum is 61.

The spelling of 217974478804 in words is "two hundred seventeen billion, nine hundred seventy-four million, four hundred seventy-eight thousand, eight hundred four".