216687644772 has 24 divisors (see below), whose sum is σ = 505622971392. Its totient is φ = 72226576800.

The previous prime is 216687644753. The next prime is 216687644783. The reversal of 216687644772 is 277446786612.

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 7 ways as a sum of consecutive naturals, for example, 27997 + ... + 658907.

It is an arithmetic number, because the mean of its divisors is an integer number (21067623808).

Almost surely, 2^216687644772 is an apocalyptic number.

It is an amenable number.

216687644772 is an abundant number, since it is smaller than the sum of its proper divisors (288935326620).

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

216687644772 is a wasteful number, since it uses less digits than its factorization.

216687644772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659539 (or 659537 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 60.

The spelling of 216687644772 in words is "two hundred sixteen billion, six hundred eighty-seven million, six hundred forty-four thousand, seven hundred seventy-two".