216671671667 has 16 divisors (see below), whose sum is σ = 263445436800. Its totient is φ = 175630285440.

The previous prime is 216671671661. The next prime is 216671671687. The reversal of 216671671667 is 766176176612.

It is a cyclic number.

It is not a de Polignac number, because 216671671667 - 2⁴ = 216671671651 is a prime.

It is a super-2 number, since 2×216671671667² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216671671661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30487817 + ... + 30494922.

It is an arithmetic number, because the mean of its divisors is an integer number (16465339800).

Almost surely, 2^216671671667 is an apocalyptic number.

216671671667 is a deficient number, since it is larger than the sum of its proper divisors (46773765133).

216671671667 is a wasteful number, since it uses less digits than its factorization.

216671671667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60982786.

The product of its digits is 5334336, while the sum is 56.

The spelling of 216671671667 in words is "two hundred sixteen billion, six hundred seventy-one million, six hundred seventy-one thousand, six hundred sixty-seven".