216667766667 has 8 divisors (see below), whose sum is σ = 315153115200. Its totient is φ = 131313797960.

The previous prime is 216667766659. The next prime is 216667766669. The reversal of 216667766667 is 766667766612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216667766667 - 2³ = 216667766659 is a prime.

It is a super-2 number, since 2×216667766667² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216667766598 and 216667766607.

It is not an unprimeable number, because it can be changed into a prime (216667766669) by changing a digit.

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, 3282844917 + ... + 3282844982.

It is an arithmetic number, because the mean of its divisors is an integer number (39394139400).

Almost surely, 2^216667766667 is an apocalyptic number.

216667766667 is a deficient number, since it is larger than the sum of its proper divisors (98485348533).

216667766667 is a wasteful number, since it uses less digits than its factorization.

216667766667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6565689913.

The product of its digits is 192036096, while the sum is 66.

Subtracting 216667766667 from its reverse (766667766612), we obtain a palindrome (549999999945).

The spelling of 216667766667 in words is "two hundred sixteen billion, six hundred sixty-seven million, seven hundred sixty-six thousand, six hundred sixty-seven".