216905864808 has 32 divisors (see below), whose sum is σ = 542374884000. Its totient is φ = 72287258688.

The previous prime is 216905864783. The next prime is 216905864843. The reversal of 216905864808 is 808468509612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797658 + ... + 1034441.

It is an arithmetic number, because the mean of its divisors is an integer number (16949215125).

Almost surely, 2^216905864808 is an apocalyptic number.

It is an amenable number.

216905864808 is an abundant number, since it is smaller than the sum of its proper divisors (325469019192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216905864808 is a wasteful number, since it uses less digits than its factorization.

216905864808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837041 (or 1837037 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 57.

The spelling of 216905864808 in words is "two hundred sixteen billion, nine hundred five million, eight hundred sixty-four thousand, eight hundred eight".