216571166551 has 8 divisors (see below), whose sum is σ = 221644836864. Its totient is φ = 211499184120.

The previous prime is 216571166549. The next prime is 216571166587. The reversal of 216571166551 is 155661175612.

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 216571166551 - 2¹ = 216571166549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216571166501) 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, 160471 + ... + 677416.

It is an arithmetic number, because the mean of its divisors is an integer number (27705604608).

Almost surely, 2^216571166551 is an apocalyptic number.

216571166551 is a deficient number, since it is larger than the sum of its proper divisors (5073670313).

216571166551 is an equidigital number, since it uses as much as digits as its factorization.

216571166551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843941.

The product of its digits is 378000, while the sum is 46.

The spelling of 216571166551 in words is "two hundred sixteen billion, five hundred seventy-one million, one hundred sixty-six thousand, five hundred fifty-one".