216722917667 has 4 divisors (see below), whose sum is σ = 216838628520. Its totient is φ = 216607206816.

The previous prime is 216722917633. The next prime is 216722917693. The reversal of 216722917667 is 766719227612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216722917667 - 2¹⁶ = 216722852131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216722917067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57852617 + ... + 57856362.

It is an arithmetic number, because the mean of its divisors is an integer number (54209657130).

Almost surely, 2^216722917667 is an apocalyptic number.

216722917667 is a deficient number, since it is larger than the sum of its proper divisors (115710853).

216722917667 is a wasteful number, since it uses less digits than its factorization.

216722917667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115710852.

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

The spelling of 216722917667 in words is "two hundred sixteen billion, seven hundred twenty-two million, nine hundred seventeen thousand, six hundred sixty-seven".