216688065772 has 24 divisors (see below), whose sum is σ = 395102307600. Its totient is φ = 103855448256.

The previous prime is 216688065757. The next prime is 216688065809. The reversal of 216688065772 is 277560886612.

It is a happy number.

216688065772 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6703303 + ... + 6735550.

It is an arithmetic number, because the mean of its divisors is an integer number (16462596150).

Almost surely, 2^216688065772 is an apocalyptic number.

It is an amenable number.

216688065772 is a deficient number, since it is larger than the sum of its proper divisors (178414241828).

216688065772 is a wasteful number, since it uses less digits than its factorization.

216688065772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13439025 (or 13439023 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 58.

The spelling of 216688065772 in words is "two hundred sixteen billion, six hundred eighty-eight million, sixty-five thousand, seven hundred seventy-two".