217206552067 has 4 divisors (see below), whose sum is σ = 228638475880. Its totient is φ = 205774628256.

The previous prime is 217206552023. The next prime is 217206552071. The reversal of 217206552067 is 760255602712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217206552067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217206552097) 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, 5715961878 + ... + 5715961915.

It is an arithmetic number, because the mean of its divisors is an integer number (57159618970).

Almost surely, 2^217206552067 is an apocalyptic number.

217206552067 is a deficient number, since it is larger than the sum of its proper divisors (11431923813).

217206552067 is a wasteful number, since it uses less digits than its factorization.

217206552067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11431923812.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 217206552067 in words is "two hundred seventeen billion, two hundred six million, five hundred fifty-two thousand, sixty-seven".